# Publikationsliste

2023

**Globally optimal univariate spline approximations**

Mohr, R.; Coblenz, M.; Kirst, P.

2023. Computational Optimization and Applications. doi:10.1007/s10589-023-00462-7

**An alternative approach to address uncertainty in hub location**

Janschekowitz, M.; Taherkhani, G.; Alumur, S. A.; Nickel, S.

2023. OR Spectrum. doi:10.1007/s00291-023-00706-2

2022

**Preface to the Special Issue Geometry, Optimization, and Convex Analysis**

Burachik, R.; Sagastizábal, C.; Stein, O.; Théra, M.

2022. Set-Valued and Variational Analysis, 30 (4), 1247–1249. doi:10.1007/s11228-022-00654-z

**Optimization under uncertainty and risk: Quadratic and copositive approaches**

Bomze, I. M.; Gabl, M.

2022. European Journal of Operational Research. doi:10.1016/j.ejor.2022.11.020

**Exact reoptimisation under gradual look-ahead for operational control in production and logistics**

Dunke, F.; Nickel, S.

2022. International Journal of Systems Science: Operations and Logistics. doi:10.1080/23302674.2022.2141590

**A multi-method approach to scheduling and efficiency analysis in dual-resource constrained job shops with processing time uncertainty**

Dunke, F.; Nickel, S.

2022. Computers and Industrial Engineering, 168, Art.-Nr.: 108067. doi:10.1016/j.cie.2022.108067

2021

**Managing the intake of new patients into a physician panel over time**

Zander, A.; Nickel, S.; Vanberkel, P.

2021. European journal of operational research, 294 (1), 391–403. doi:10.1016/j.ejor.2021.01.035

**Demand and Capacity Management for Medical Practices**. Dissertation

Zander, A.

2021, September 24. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000137945

**Ein Entscheidungsunterstützungssystem zur Priorisierung ungeplanter Stillstände für eine ausbringungsoptimierte Durchführung reaktiver sowie proaktiver Instandhaltungsmaßnahmen**. Dissertation

Hegemann, M.

2021, März 2. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000130039

**Strategic planning of operating room session allocation using stability analysis**

Faeghi, S.; Lennerts, K.; Nickel, S.

2021. Health Systems. doi:10.1080/20476965.2021.1997651

**Simulation-based multi-criteria decision making: an interactive method with a case study on infectious disease epidemics**

Dunke, F.; Nickel, S.

2021. Annals of Operations Research. doi:10.1007/s10479-021-04321-8

**Modeling a pre-hospital emergency medical service using hybrid simulation and a machine learning approach**

Olave-Rojas, D.; Nickel, S.

2021. Simulation Modelling Practice and Theory, 109, Art.-Nr.: 102302. doi:10.1016/j.simpat.2021.102302

**Exact distributional analysis of online algorithms with lookahead**

Dunke, F.; Nickel, S.

2021. 4OR, 19, 199–233. doi:10.1007/s10288-020-00442-1

**Online optimization with gradual look-ahead**

Dunke, F.; Nickel, S.

2021. Operational research, 21, 2489–2523. doi:10.1007/s12351-019-00506-z

2020

**Emergency rapid mapping with drones: models and solution approaches for offline and online mission planning**. Dissertation

Glock, K. D.

2020, Oktober 21. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000124518

**A structuring review on multi-stage optimization under uncertainty: Aligning concepts from theory and practice**

Bakker, H.; Dunke, F.; Nickel, S.

2020. Omega, 96, Art. Nr.: 102080. doi:10.1016/j.omega.2019.06.006

**Towards a stochastic programming modeling framework for districting**

Diglio, A.; Nickel, S.; Saldanha da Gama, F.

2020. Annals of operations research, 292 (1), 249–285. doi:10.1007/s10479-020-03631-7

**Decentralized patient-centric data management for sharing IoT data streams**

Lucking, M.; Manke, R.; Schinle, M.; Kohout, L.; Nickel, S.; Stork, W.

2020. 2020 International Conference on Omni-layer Intelligent Systems (COINS), August 31 - September 2, 2020, Barcelona, Spain, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/COINS49042.2020.9191653

**A data-driven methodology for the automated configuration of online algorithms**

Dunke, F.; Nickel, S.

2020. Decision support systems, 137, Art.-Nr.: 113343. doi:10.1016/j.dss.2020.113343

**Improving company-wide logistics through collaborative track and trace IT services**

Dunke, F.; Nickel, S.

2020. International journal of logistics systems and management, 35 (3), 329–353. doi:10.1504/IJLSM.2020.105916

**Neural networks for the metamodeling of simulation models with online decision making**

Dunke, F.; Nickel, S.

2020. Simulation modelling practice and theory, 99, 102016. doi:10.1016/j.simpat.2019.102016

2019

**The formulas for the representation of functions of two variables as a difference of sublinear functions**

Grzybowski, J.; Pallaschke, D.; Urbański, R.

2019. Optimization, 68 (10), 2055–2070. doi:10.1080/02331934.2018.1491572

**Day-ahead and online decision-making for collaborative on-site logistics**

Dunke, F.; Nickel, S.

2019. Journal of simulation, 13 (2), 138–151. doi:10.1080/17477778.2018.1485616

**Centralising the Admission Process in a German Hospital**

Reuter-Oppermann, M.; Kienzle, L.; Zander, A.; Buchmüller, D.; Goldberg, D.

2019. Proceedings of the 52nd Hawaii International Conference on System Sciences, 4098–4106, University of Hawaii at Manoa, Hamilton Library, ScholarSpace. doi:10.24251/HICSS.2019.497

**Scheduling and Routing of Truck Drivers Considering Regulations on Drivers’ Working Hours**. Dissertation

Kleff, A.

2019. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000097855

**A multi-objective mathematical model to redesign of global sustainable bioenergy supply network**

Razm, S.; Nickel, S.; Sahebi, H.

2019. Computers & chemical engineering, 128, 1–20. doi:10.1016/j.compchemeng.2019.05.032

**Location planning of charging stations for electric city buses**. Dissertation

Rohrbeck, B.

2019. Shaker Verlag

**A multi-period multi-criteria districting problem applied to primary care scheme with gradual assignment**

Yanık, S.; Kalcsics, J.; Nickel, S.; Bozkaya, B.

2019. International transactions in operational research, 26 (5), 1676–1697. doi:10.1111/itor.12633

**A global bioenergy supply network redesign through integrating transfer pricing under uncertain condition**

Razm, S.; Nickel, S.; Saidi-mehrabad, M.; Sahebi, H.

2019. Journal of cleaner production, 208, 1081–1095. doi:10.1016/j.jclepro.2018.10.070

**On the Impact of the Customer Base on the Added Value through System-Oriented Service Delivery in Industrial Maintenance [in press]**

Wolff, C.; Reuter-Oppermann, M.; Kühl, N.

2019. Hawaii International Conference on System Sciences (HICSS-52), Grand Wailea, Maui, Hawaii, January 8-11, 2019

2018

**A bi-objective stochastic location-inventory-routing model for microalgae-based biofuel supply chain**

Asadi, E.; Habibi, F.; Nickel, S.; Sahebi, H.

2018. Applied energy, 228, 2235–2261. doi:10.1016/j.apenergy.2018.07.067

**A branch-and-price algorithm for the scheduling of customer visits in the context of multi-period service territory design**

Bender, M.; Kalcsics, J.; Nickel, S.; Pouls, M.

2018. European journal of operational research, 269 (1), 382–396. doi:10.1016/j.ejor.2018.01.047

**The impact of electricity tariffs on residential demand side flexibility: results of bottom-up load profile modeling**

Hayn, M.; Zander, A.; Fichtner, W.; Nickel, S.; Bertsch, V.

2018. Energy systems, 9 (3), 759–792. doi:10.1007/s12667-018-0278-8

**Ascent and descent cones of ordered median block functions**

Grzybowski, J.; Kalcsics, J.; Nickel, S.; Pallaschke, D.; Urbański, R.

2018. Optimization, 67 (5), 507–522. doi:10.1080/02331934.2018.1429432

**Improving hospital layout planning through clinical pathway mining**

Arnolds, I. V.; Gartner, D.

2018. Annals of operations research, 263 (1-2), 453–477. doi:10.1007/s10479-017-2485-4

**An Innovative Concept for Teaching Operations Research Applied to Health Care**

Reuter-Oppermann, M.; Zander, A.; Nickel, S.

2018. Advances in Operations Research Education. Ed.: J. Beliën, 95–105, Springer International Publishing. doi:10.1007/978-3-319-74104-8_7

**Location Planning of Charging Stations for Electric City Buses Considering Battery Ageing Effects**

Rohrbeck, B.; Berthold, K.; Hettich, F.

2018. Operations Research Proceedings - Selected Papers of the Annual International Conference of the German Operations Research Society (GOR), Berlin, Germany, September 6-8, 2017. Ed.: N. Kliewer, 701 – 707, Springer. doi:10.1007/978-3-319-89920-6_93

**Reduced and Minimally Convex Pairs of Sets**

Grzybowski, J.; Pallaschke, D.; Przybycień, H.; Urbański, R.

2018. Journal of convex analysis, 25 (4), 1319–1334

**Modeling congestion and service time in hub location problems**

Alumur, S. A.; Nickel, S.; Rohrbeck, B.; Saldanha-da-Gama, F.

2018. Applied mathematical modelling, 55, 13–32. doi:10.1016/j.apm.2017.10.033

2017

**Rethinking supply chain risk analysis : common flaws & main elements**

Heckmann, I.; Nickel, S.

2017. Supply chain forum, 18 (2), 84–95. doi:10.1080/16258312.2017.1348871

**Recent Mathematical Approaches to Service Territory Design**. Dissertation

Bender, M.

2017. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000075947

**The Air Cargo Load Planning Problem**. Dissertation

Brandt, F.

2017. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000075507

**A stochastic multi-period capacitated multiple allocation hub location problem: Formulation and inequalities**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2017. Omega, 74, 122–134. doi:10.1016/j.omega.2017.01.011

**On some consequences of Mazur–Orlicz theorem to Hahn–Banach–Lagrange theorem**

Grzybowski, J.; Pallaschke, D.; Przybycień, H.; Urbański, R.

2017. Optimization, 67 (7), 1005–1015. doi:10.1080/02331934.2017.1295044

2016

**Ambulance location under stochastic demand: A sampling approach**

Nickel, S.; Reuter-Oppermann, M.; Saldanha-da-Gama, F.

2016. Operations research for health care, 8, 24–32. doi:10.1016/j.orhc.2015.06.006

**Towards a Customer-Oriented Queuing in Service Incident Management**

Hottum, P.; Reuter-Oppermann, M.

2016. Operations Research Proceedings 2014 - Selected Papers of the Annual International Conference of the German Operations Research Society (OR), Aachen, Germany, September 2-5, 2014. Ed.: M. Lübbecke, 233–239, Springer International Publishing. doi:10.1007/978-3-319-28697-6_33

**Workload patterns of fast charging stations along the German Autobahn**

Jochem, P.; Landes, P.; Reuter-Oppermann, M.; Fichtner, W.

2016. Proceedings of EVS29 Symposium. Montréal, Québec, CDN, June 19-22, 2016, EVS

**Scheduling policies for multi-period services**

Nunez-del-Toro, C.; Fernandez, E.; Kalcsics, J.; Nickel, S.

2016. European journal of operational research, 251 (3), 751–770. doi:10.1016/j.ejor.2015.12.002

**Workload patterns of fast charging stations along the German Autobahn**

Jochem, P.; Landes, P.; Reuter-Oppermann, M.; Fichtner, W.

2016. World Electric Vehicle Journal, 8 (4), 926–923

**An easy path to convex analysis and applications**

Pallaschke, D.

2016. Optimization, 65 (2), 567–568. doi:10.1080/02331934.2015.1032286

**The multi-period service territory design problem – An introduction, a model and a heuristic approach**

Bender, M.; Meyer, A.; Kalcsics, J.; Nickel, S.

2016. Transportation research / E, 96, 135–157. doi:10.1016/j.tre.2016.09.007

**Reduced Pairs of Compact Convex Sets and Ordered Median Functions**

Grzybowski, J.; Pallaschke, D.; Urbański, R.

2016. Journal of optimization theory and applications, 171 (2), 354–364. doi:10.1007/s10957-015-0860-3

**Evaluating the quality of online optimization algorithms by discrete event simulation**

Dunke, F.; Nickel, S.

2016. Central European journal of operations research, 25 (4), 831–858. doi:10.1007/s10100-016-0455-6

**A Modeling Framework for Stochastic Multi-Period Capacitated Multiple Allocation Hub Location**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2016. ILS : 6th International Conference on Information Systems, Logistics and Supply Chain, June 1-4, 2016

**The Risk-Aware Multi-Period Capacitated Plant Location Problem (CPLP-Risk)**

Heckmann, I.; Nickel, S.; Saldanha-da-Gama, F.

2016. 6th International Conference on Information Systems, Logistics and Supply Chain (ILS), Bordeaux, France, June 1–4, 2016, 1–6

**Supply Chain Risk Analysis – Common Flaws, Core Areas, and Main Tasks**

Heckmann, I.

2016. Towards Supply Chain Risk Analytics : Fundamentals, Simulation, Optimization, 77–129, Springer Verlag. doi:10.1007/978-3-658-14870-6_4

**Time traps in supply chains: Is optimal still good enough?**

Dunke, F.; Heckmann, I.; Nickel, S.; Saldanha-da-Gama, F.

2016. European journal of operational research. doi:10.1016/j.ejor.2016.07.016

**Banach Limits of Locally Bounded Real Functions on Hausdorff Spaces**

Pallaschke, D.; Pumplün, D.

2016. Applied categorical structures, 1–12. doi:10.1007/s10485-016-9460-0

**A general modeling approach to online optimization with lookahead**

Dunke, F.; Nickel, S.

2016. Omega, 63, 134–153. doi:10.1016/j.omega.2015.10.009

**Districting Problems - New Geometrically Motivated Approaches**. Dissertation

Butsch, A.

2016. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000058069

**Moving towards an equitable long-term care network : A multi-objective and multi-period planning approach**

Cardoso, T.; Oliveira, M. D.; Barbósa-Póvoa, A. P. F. D.; Nickel, S.

2016. Omega, 58, 69–85. doi:10.1016/j.omega.2015.04.005

2015

**Multi-period hub network design problems with modular capacities**

Alumur, S. A.; Nickel, S.; Saldanha-da-Gama, F.; Seçerdin, Y.

2015. Annals of operations research, 246 (1-2), 289–312. doi:10.1007/s10479-015-1805-9

**Multi-period hub location problems in transportation**

Gelareh, S.; Monemi, R. N.; Nickel, S.

2015. Transportation research / E, 75, 67–94. doi:10.1016/j.tre.2014.12.016

**Several 2-facility location problems on networks with equity objectives**

Kalcsics, J.; Nickel, S.; Puerto, J.; Rodriguez-Chia, A. M.

2015. Networks, 65 (1), 1–9. doi:10.1002/net.21568

**Introducing health gains in location-allocation models: A stochastic model for planning the delivery of long-term care**

Cardoso, T.; Oliveira, M. D.; Barbósa-Póvoa, A. P. F. D.; Nickel, S.

2015. Journal of physics / Conference Series, 616 (1), Article no: 012007. doi:10.1088/1742-6596/616/1/012007

**An integrated approach for planning a long-term care network with uncertainty, strategic policy and equity considerations**

Cardoso, T.; Oliveira, M. D.; Barbósa-Póvoa, A. P. F. D.; Nickel, S.

2015. European Journal of Operational Research, 247 (1), 321–334. doi:10.1016/j.ejor.2015.05.074

**How many patient transfer rooms are necessary for my OR suite? : Effect of the number of OR transfer rooms on waiting times and patient throughput in the OR – analysis by simulation = Wie viele Patientenschleusen braucht mein OP-Bereich? : Einfluss der Zahl von OP-Schleusen auf Wartezeiten und Patientendurchsatz im OP – Analyse mithilfe einer Simulation**

Messer, C.; Zander, A.; Arnolds, I. V.; Nickel, S.; Schuster, M.

2015. Der Anaesthesist, 64 (12), 958–967. doi:10.1007/s00101-015-0108-5

**Fundamentals of service systems**

Cardoso, J.; Fromm, H.; Nickel, S.; Satzger, G.; Studer, R.; Weinhardt, C. (Hrsg.)

2015. Springer Verlag. doi:10.1007/978-3-319-23195-2

**Structural Properties of Voronoi Diagrams in Facility Location Problems with Continuous Demand**

Averbakh, I.; Berman, O.; Kalcsics, J.; Krass, D.

2015. Operations Research, 63 (2), 394–411. doi:10.1287/opre.2015.1354

**A critical review on supply chain risk - Definition, measure and modeling**

Heckmann, I.; Comes, T.; Nickel, S.

2015. Omega, 52, 119–132. doi:10.1016/j.omega.2014.10.004

**On topological types of ordered median functions**

Grzybowski, J.; Nickel, S.; Pallaschke, D.; Urbański, R.; Kalcsics, J.

2015. Optimization, 64 (1), 149–160. doi:10.1080/02331934.2014.883512

**Joint venture formation and partner selection in upstream crude oil section: Goal programming application**

Sahebi, H.; Nickel, S.; Ashayeri, J.

2015. International Journal of Production Research, 53 (10), 3047–3061. doi:10.1080/00207543.2014.970708

**On max-min representations of ordered median functions**

Grzybowski, J.; Kalcsics, J.; Nickel, S.; Pallaschke, D.; Urbanski, R.

2015. Optimization, 64 (2), 339–348. doi:10.1080/02331934.2012.750322

2014

**Strategic and tactical mathematical programming models within the crude oil supply chain context : A review**

Sahebi, H.; Nickel, S.; Ashayeri, J.

2014. Computers & chemical engineering, 68, 56–77, Elsevier. doi:10.1016/j.compchemeng.2014.05.008

**Environmentally conscious design of upstream crude oil supply chain**

Sahebi, H.; Nickel, S.; Ashayeri, J.

2014. Industrial and Engineering Chemistry Research, 53 (28), 11501–11511. doi:10.1021/ie403492c

**Cooperative covering problems on networks**

Averbakh, I.; Berman, O.; Krass, D.; Kalcsics, J.; Nickel, S.

2014. Networks, 63 (4), 334–349. doi:10.1002/net.21549

**The multicriteria p-facility median location problem on networks**

Kalcsics, J.; Nickel, S.; Pozo, M. A.; Puerto, J.; Rodríguez-Chía, A. M.

2014. European journal of operational research, 235 (3), 484–493. doi:10.1016/j.ejor.2014.01.003

**An efficient heuristic approach for a multi-period logistics network redesign problem**

Melo, M. T.; Nickel, S.; Saldanha-da-Gama, F.

2014. TOP, 22 (1), 80–108. doi:10.1007/s11750-011-0235-3

**Modellierung und Planung von Dienstleistungen im Rettungswesen mit Verfahren des Operations Research**

Reuter, M.; Rashid, A.; Nickel, S.

2014. Dienstleistungsmodellierung 2012. Hrsg.: O. Thomas, 291–304, Springer Fachmedien Wiesbaden. doi:10.1007/978-3-658-00863-5_14

**Multi-product Capacitated Single-Allocation Hub Location Problems : Formulations and Inequalities**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2014. Networks and spatial economics, 14 (1), 1–25. doi:10.1007/s11067-013-9197-3

**Districting for arc routing**

Butsch, A.; Kalcsics, J.; Laporte, G.

2014. INFORMS Journal on Computing, 26 (4), 809–824. doi:10.1287/ijoc.2014.0600

**Towards a Customer-oriented Queuing in Service Incident Management**

Hottum, P.; Reuter-Oppermann, M.

2014. International Conference of the German Operations Research Society (OR), Aachen, Germany, September 2-5, 2014

**Online Optimization with Lookahead**. Dissertation

Dunke, F.

2014. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000042132

2013

**Anwendung von OR- Methoden für Planungsaufgaben in einer Strahlenklinik**

Arnolds, I. V.; Nickel, S.; Reuter, M.

2013. Management science : Modelle und Methoden zur quantitativen Entscheidungsunterstützung. Hrsg.: K. Armborst, 69–88, Verlag Dr. Kovač

**Models for ambulance planning on the strategic and the tactical level**

Essen, J. T. van; Hurink, J. L.; Nickel, S.; Reuter, M.

2013. Technische Universität Eindhoven (TU Eindhoven)

**The maximum dispersion problem**

Fernandez, E.; Kalcsics, J.; Nickel, S.

2013. Omega, 41 (4), 721–730. doi:10.1016/j.omega.2012.09.005

**Multi-period layout planning for hospital wards**

Arnolds, I. V.; Nickel, S.

2013. Socio-Economic Planning Sciences, 47 (3), 220–237. doi:10.1016/j.seps.2013.02.001

**Strategic and Tactical Crude Oil Supply Chain: Mathematical Programming Models**. Dissertation

Sahebishahemabadi, H.

2013. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000039373

**Simulation und Optimierung logistischer Prozesse in der Wärmebehandlung von Stahl**. Dissertation

Ebermann, E.

2013. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000032354

2012

**Mid-term and short-term planning support for home health care services**

Nickel, S.; Schröder, M.; Steeg, J.

2012. European journal of operational research, 219 (3), 574–587. doi:10.1016/j.ejor.2011.10.042

**A multi-stage stochastic supply network design problem with financial decisions and risk management**

Nickel, S.; Saldanha-da-Gama, F.; Ziegler, H.-P.

2012. Omega, 40 (5), 511–524. doi:10.1016/j.omega.2011.09.006

**Scheduling steel plates on a roller furnace**

Ebermann, E.; Nickel, S.

2012. Operations Research Proceedings 2011 - Selected Papers of the International Conference on Operations Research (OR’11), Zürich, Schweiz, August 30 - September 2, 2011. Ed.: D. Klatte, 389–394, Springer Verlag. doi:10.1007/978-3-642-29210-1_62

**A tabu search heuristic for redesigning a multi-echelon supply chain network over a planning horizon**

Melo, M. T.; Nickel, S.; Saldanha-Da-Gama, F.

2012. International Journal of Production Economics, 136 (1), 218–230. doi:10.1016/j.ijpe.2011.11.022

**Stochastic analysis of ordered median problems**

Drezner, Z.; Nickel, S.; Ziegler, H.-P.

2012. Journal of the Operational Research Society, 63 (11), 1578–1588. doi:10.1057/jors.2012.2

**Modeling the demand for long-term care services under uncertain information**

Cardoso, T.; Oliveira, M. D.; Barbosa-Povoa, A.; Nickel, S.

2012. Health care management science, 15 (4), 385–412. doi:10.1007/s10729-012-9204-0

**Multi-period reverse logistics network design**

Alumur, S. A.; Nickel, S.; Saldanha-Da-Gama, F.; Verter, V.

2012. European Journal of Operational Research, 220 (1), 67–78. doi:10.1016/j.ejor.2011.12.045

**Hub location under uncertainty**

Alumur, S. A.; Nickel, S.; Saldanha-da-Gama, F.

2012. Transportation Research Part B: Methodological, 46 (4), 529–543. doi:10.1016/j.trb.2011.11.006

**Multiperiod location-routing with decoupled time scales**

Albareda-Sambola, M.; Fernandez, E.; Nickel, S.

2012. European Journal of Operational Research, 217 (2), 248–258. doi:10.1016/j.ejor.2011.09.022

**Algorithms for Linear Stochastic Programs and their Application in Supply Chain Network Design Problems**. Dissertation

Ziegler, H.-P.

2012. Kovac

**Cephoids: Duality and Reference Vectors**

Pallaschke, D.; RosenmŸller, J.

2012. Pacific Journal of Optimization, 8, 157–184

2011

**Impact of IT-supported clinical pathways on medical staff satisfaction : A prospective longitudinal cohort study**

Schuld, J.; Schäfer, T.; Nickel, S.; Jacob, P.; Schilling, M. K.; Richter, S.

2011. International journal of medical informatics, 80 (3), 151–156. doi:10.1016/j.ijmedinf.2010.10.012

**Hub location problems in transportation networks**

Gelareh, S.; Nickel, S.

2011. Transportation research / E, 47 (6), 1092–1111. doi:10.1016/j.tre.2011.04.009

**Hub and spoke network design with single-assignment, capacity decisions and balancing requirements**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2011. Applied mathematical modelling, 35 (10), 4841–4851. doi:10.1016/j.apm.2011.03.046

**Continuous piecewise linear functions on the octants of Rn**

Grzybowski, J.; Pallaschke, D.; Urbanski, R.

2011. Optimization, 60 (1-2), 101–112

**Commutative Semigroups with Cancellation Law: A Representation Theorem**

Grzybowski, J.; Pallaschke, D.; Przybycien, H.; Urbanski, R., Ryszard

2011. Semigroup Forum, 83 (3), 447–456

**Ordered Median Functions and Symmetries**

Grzybowski, J.; Nickel, S.; Pallaschke, D.; Urbanski, R.

2011. Optimization, 60 (7-9), 801–811

**Data preprocessing in semi-supervised SVM classification**

Astorino, A.; Gaudioso, M.; Gorgone, E.; Pallaschke, D.

2011. Optimization, 60 (1-2), 143–151. doi:10.1080/02331931003692557

2010

**An extended covering model for flexible discrete and equity location problems**

Marin, A.; Nickel, S.; Velten, S.

2010. Mathematical Methods of Operations Research, 71 (1), 125–163. doi:10.1007/s00186-009-0288-3

**Extensions to the continuous ordered median problem**

Krebs, J.; Nickel, S.

2010. Mathematical Methods of Operations Research, 71 (2), 283–306. doi:10.1007/s00186-009-0296-3

**Klinische Behandlungspfade - Integration logistischer Planungsaufgaben**

Kraus, K.; Nickel, S.; Richter, R.; Schilling, M. K.; Schmidt, U. A.; Schuld, J.

2010. Professional process, 2 (1), 12–15

**Distribution systems design with role dependent objectives**

Kalcsics, J.; Nickel, S.; Puerto, J.; Rodriguez-Chia, A. M.

2010. European journal of operational research, 202 (2), 491–501. doi:10.1016/j.ejor.2009.06.001

**The ordered capacitated facility location problem**

Kalcsics, J.; Nickel, S.; Puerto, J.; Rodriguez-Chia, A. M.

2010. Top, 18 (1), 203–222. doi:10.1007/s11750-009-0089-0

**Liner shipping hub network design in a competitive environment**

Gelareh, S.; Nickel, S.; Pisinger, D.

2010. Transportation research / E, 46 (6), 991–1004. doi:10.1016/j.tre.2010.05.005

**A novel maximum dispersion territory design model arising in the implementation of the WEEE-directive**

Fernandez, E.; Kalcsics, J.; Nickel, S.; Rios-Mercado, R. Z.

2010. Journal of the Operational Research Society, 61 (3), 503–514. doi:10.1057/jors.2009.70

**Single-Allocation Hub Location Problems with Capacity Decisions and Balancing Requirements**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2010. 12th WSEAS International Conference on Mathematical and Computational Methods in Science and Engineering (MACMESE’10), Faro, Portugal, November 3-5, 2010. Ed.: L. Rogozea, 51–56, WSEAS-Press

**Single-assignment hub location problems with multiple capacity levels**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2010. Transportation research / B, 44 (8-9), 1047–1066. doi:10.1016/j.trb.2009.12.016

**The capacitated single-allocation hub location problem revisited : A note on a classical formulation**

Correia, I.; Nickel, S.; Saldanha-da-Gama, F.

2010. European journal of operational research, 207 (1), 92–96. doi:10.1016/j.ejor.2010.04.015

**Dynamic transportation of patients in hospitals**

Beaudry, A.; Laporte, G.; Melo, T.; Nickel, S.

2010. OR spectrum, 32 (1), 77–107. doi:10.1007/s00291-008-0135-6

**Separation of Convex Sets by Clarke subdifferential**

Gaudioso, M.; Gorgone, E.; Pallaschke, D.

2010. Optimization, 59 (8), 1199–1210. doi:10.1080/02331930903085367

**Performancevergleich zwischen simulationsbasierter Online- und Offline-Optimierung anhand von Scheduling-Problemen**

Nickel, S.; Heib, C.

2010. Integrationsaspekte der Simulation: Technik, Orgnisation und Personal, Karlsruhe, 7. und 8. Oktober 2010 = Integration Aspects of Simulation: Equipment, Organization and Personnell, Karlsruhe, 7th and 8th October 2010. Hrsg.: G. Zülch, 205–214, KIT Scientific Publishing. doi:10.1007/978-3-642-14536-0_17

**Cephoids: Minkowski sums of de Gua simplexes**

Pallaschke, D.; Rosenmüller, J.

2010. Optimization, 59 (4), 515–540. doi:10.1080/02331930801951280

**Morse indexes for piecewise linear functions**

Pallaschke, D.; Urbanski, R.

2010. Nonlinear analysis and optimization. Vol 2: Optimization. Ed.: A. Leizarowitz, 213–223, Am. Math. Soc

**A Note on the Dual of the Minkowski-Radström-Hörmander Lattice**

Grzybowski, J.; Pallaschke, D.; Urbanski, R.

2010. Pacific Journal of Optimization, 6, 255–262

**On the amount of minimal pairs of convex sets**

Grzybowski, J.; Pallaschke, D.; Urbanski, R.

2010. Optimization Methods and Software, 25, 89–96. doi:10.1080/10556780903187460

**Reduction of finite exhausters**

Grzybowski, J.; Pallaschke, D.; Urbanski, R.

2010. Journal of Global Optimization, 46, 589–601. doi:10.1007/s10898-009-9444-9

**Kostenorientierte Optimierung komplexer Fertigungssysteme mithilfe von Simulationsmodellen**. Dissertation

Heib, C.

2010. Shaker Verlag

2009

**Process improvement in Hospitals: A case study in a radiology department**

Nickel, S.; Schmidt, U.-A.

2009. Quality management in health care, 18 (4), 326–338. doi:10.1097/QMH.0b013e3181bee127

**Logistics network design**

Nickel, S.; Saldanha-Da-Gama, F.

2009. OR Spectrum, 31 (3), 461–463. doi:10.1007/s00291-009-0165-8

**Multifacility and Restricted Location Problems**

Hamacher, H. W.; Nickel, S.

2009. Encyclopedia of Optimization. Ed.: C.A. Floudas, 2409–2413, Springer US. doi:10.1007/978-0-387-74759-0_414

**The Ordered Gradual Covering Location Problem on a Network**

Berman, O.; Kalcsics, J.; Krass, D.; Nickel, S.

2009. Discrete Applied Mathematics, 157 (18), 3689–3707. doi:10.1016/j.dam.2009.08.003

**Solving the ordered one-median problem in the plane**

Drezner, Z.; Nickel, S.

2009. European Journal of Operational Research (EJOR), 195 (1), 46–61

**A flexible model and efficient solution strategies for discrete location problems**

Marína, A.; Nickel, S.; Puertoc, J.; Velten, S.

2009. Discrete Applied Mathematics, 157 (5), 1128–1145

**Facility location and supply chain management - A review**

Nickel, S.; Melo, M. T.; Saldanha-da-Gama, F.

2009. European Journal of Operational Research (EJOR), 196 (2), 401–412

**Bringing robustness to patient flow management through optimized patient transports in hospitals**

Hanne, T.; Melo, T.; Nickel, S.

2009. Interfaces, 39 (3), 241–255. doi:10.1287/inte.1080.0379

**Constructing a DC Decomposition for Ordered Median Problems**

Drezner, Z.; Nickel, S.

2009. Journal of Global Optimization, 45 (2), 187–201

# Publikationen

### 2016

- T. Cardoso, M. D. Oliveira, A. Barbosa-Póvoa, and S. Nickel.
*Moving towards an equitable long-term care network: A multi-objective and multi-period planning approach.*Omega, 58, 69 - 85, 2015. - A. Zander and U. Mohring.
*Dynamic appointment scheduling with patient time preferences and different service time lengths.*International Conference on Applied Operational Research, Proceedings, 8, 72 - 77, 2016. - I. Correia, S. Nickel, and F. Saldanha-da-Gama.
*A modeling framework for stochastic multi-period capacitated multiple allocation hub location.*ILS 2016 - 6th International Conference on Information Systems, Logistics and Supply Chain, 2016. - I. Heckmann, S. Nickel, and F. Saldanha-da-Gama.
*The risk-aware multi-period capacitated plant location problem (CPLP-Risk).*ILS 2016 - 6th International Conference on Information Systems, Logistics and Supply Chain, 2016. - F. Dunke and S. Nickel.
*A general modeling approach to online optimization with lookahead.*Omega, 63, 134 - 153, 2016. - I. Heckmann and S. Nickel.
*Supply chain risk analysis - Common flaws, core areas, and main tasks.*ILS 2016 - 6th International Conference on Information Systems, Logistics and Supply Chain, 2016. - F. Dunke and S. Nickel.
*Time traps in supply chains: Is optimal still good enough?*European Journal of Operational Research, article in press, 2016. - S. Nickel, M. Reuter-Oppermann, and F. Saldanha-da-Gama.
*Ambulance location under stochastic demand: A sampling approach.*Operations Research for Health Care, 8, 24 - 32, 2016. - J. Wirnitzer, I. Heckmann, A. Meyer, and S. Nickel.
*Patient-based nurse rostering in home care.*Operations Research for Health Care, 8, 91 - 102, 2016.

### 2015

- T. Cardoso, M. D. Oliveira, A. Barbosa-Póvoa, and S. Nickel.
*An integrated approach for planning a long-term care network with uncertainty, strategic policy and equity considerations.*European Journal of Operational Research, 247(1), 321 - 334, 2015. - T. Cardoso, M. D. Oliveira, A. Barbosa-Póvoa, and S. Nickel.
*Introducing health gains in location-allocation models: A stochastic model for planning the delivery of long-term care.*Journal of Physics: Conference Series, 616(1), 012007, 2015. - J. Kalcsics, S. Nickel, J. Puerto, and A.M. Rodríguez-Chía.
*Several 2-facility location problems on networks with equity objectives.*Networks, 65(1), 1 - 9, 2015. - J. Grzybowski, J. Kalcsics, S. Nickel, D. Pallaschke, and R. Urbański.
*On max–min representations of ordered median functions.*Optimization, 64(2), 339 - 348, 2015. - H. Sahebi, S. Nickel, J. Ashayeri.
*Joint venture formation and partner selection in upstream crude oil section: Goal programming application.*International Journal of Production Research, 53(10), 3047 - 3061, 2015. - J. Grzybowski, J. Kalcsics, S. Nickel, D. Pallaschke, and R. Urbański.
*On topological types of ordered median functions.*Optimization, 64(1), 149 - 160, 2015. - S.A. Alumur, S. Nickel, F. Saldanha-da-Gama, Y. Seçerdin.
*Multi-period hub network design problems with modular capacities.*Annals of Operations Research, 2015. - S. Gelareh, R. Neamatian Monemi, and S.Nickel.
*Multi-period hub location problems in transportation.*Transportation Research Part E: Logistics and Transportation Review, 75, 67 - 94, 2015. - I. Heckmann, T. Comes, and S. Nickel.
*A critical review on supply chain risk - Definition, measure and modeling.*Omega, 52, 119 - 132, 2015. - C. Messer, A. Zander, I. Arnolds, S. Nickel, and M. Schuster.
*How many patient transfer rooms are necessary for my OR suite?: Effect of the number of OR transfer rooms on waiting times and patient throughput in the OR – analysis by simulation [Wie viele Patientenschleusen braucht mein OP-Bereich?: Einfluss der Zahl von OP-Schleusen auf Wartezeiten und Patientendurchsatz im OP – Analyse mithilfe einer Simulation].*Anaesthesist, 64(12), 958 - 967, 2015. - M. Reuter-Oppermann and A. Zander.
*Service Optimization.*Fundamentals of Service Systems, In: Cardoso, J.; Fromm, H.; Studer, R.; Nickel, S.; Weinhardt, C.; Satzger, G. (eds.), 217 - 260, 2015.

### 2014

- A. Butsch, J. Kalcsics, and G. Laporte.
*Districting for arc routing.*Informs Journal on Computing, 26(4), 809 - 824, 2014. - H. Sahebi and S. Nickel.
*Offshore oil network design with transportation alternatives.*European Journal of Industrial Engineering, 8(6), 739 - 761, 2014. - I. Averbakh, O. Berman, D. Krass, J. Kalcsics, and S. Nickel.
*Cooperative covering problems on networks.*Networks, 63(4), 334 - 349, 2014. - I. Correia, S. Nickel, and F. Saldanha-da-Gama.
*Multi-product Capacitated Single-Allocation Hub Location Problems: Formulations and Inequalities.*Networks and Spatial Economics, 14(1), 1 - 25, 2014. - M.T. Melo, S. Nickel, and F. Saldanha-da-Gama.
*An efficient heuristic approach for a multi-period logistics network redesign problem.*TOP, 22(1), 80 - 108, 2014. - J. Kalcsics, S. Nickel, M.A. Pozo, J. Puerto, and A.M. Rodríguez-Chía.
*The multicriteria p-facility median location problem on networks.*European Journal of Operational Research, 235(3), 484 - 493, 2014. - H. Sahebi, S. Nickel, and J. Ashayeri.
*Environmentally conscious design of upstream crude oil supply chain.*Industrial and Engineering Chemistry Research, 53(28), 11501 - 11511, 2014. - H. Sahebi, S. Nickel, and J. Ashayeri.
*Strategic and tactical mathematical programming models within the crude oil supply chain context: A review.*Computers and Chemical Engineering, 68, 56 - 77, 2014.

### 2013

- I. V. Arnolds and S. Nickel.
*Multi-period layout planning for hospital wards.*Socio-Economic Planning Sciences, 47(3), 220 - 237, 2013. - I. Correia, S. Nickel, and F. Saldanha-da Gama.
*Multi-product capacitated single-allocation hub location problems: Formulations and inequalities.*Networks and Spatial Economics, 1-25, 2013. - E. Fernández, J. Kalcsics, and S. Nickel.
*The maximum dispersion problem.*Omega, 41(4), 721 - 730, 2013. - M. Reuter, A. Rashid, and S. Nickel.
*Modellierung und Planung von Dienstleistungen im Rettungswesen mit Verfahren des Operations Research.*In: O. Thomas and M. Nüttgens (editors), Dienstleistungsmodellierung 2012, 291-304. Springer Fachmedien Wiesbaden, 2013. - J. Grzybowski, J. Kalcsics, S. Nickel, D. Pallaschke, and R. Urbanski.
*On max-min representations of ordered median functions.*Optimization, 2013. Article in Press.

### 2012

- M. Albareda-Sambola, E. Fernández, and S. Nickel.
*Multiperiod location-routing with decoupled time scales.*European Journal of Operational Research, 217(2), 248 - 258, 2012. - S. A. Alumur, S. Nickel, and F. S. da Gama.
*Hub location under uncertainty.*Transportation Research Part B: Methodological, 46(4), 529 - 543, 2012. - S. A. Alumur, S. Nickel, F. S. da Gama, and V. Verter.
*Multi-period reverse logistics network design.*European Journal of Operational Research, 220(1), 67 - 78, 2012. - T. Cardoso, M. Oliveira, A. Barbosa-Póvoa, and S. Nickel.
*Modeling the demand for long-term care services under uncertain information.*Health Care Management Science, 15(4), 385-412, 2012. - Z. Drezner, S. Nickel, and H.-P. Ziegler.
*Stochastic analysis of ordered median problems.*Journal of the Operational Research Society, 63(11), 1578-1588, 2012. - M. Melo, S. Nickel, and F. S. da Gama.
*A tabu search heuristic for redesigning a multi-echelon supply chain network over a planning horizon.*International Journal of Production Economics, 136(1), 218 - 230, 2012. - E. Ebermann and S. Nickel.
*Scheduling steel plates on a roller furnace.*In: D. Klatte, H.-J. Lüthi, and K. Schmedders (editors), Operations Research Proceedings 2011, Operations Research Proceedings, 389-394. Springer Berlin, 2012. - S. Nickel, F. S. da Gama, and H.-P. Ziegler.
*A multi-stage stochastic supply network design problem with financial decisions and risk management.*Omega, 40(5), 511 - 524, 2012. - S. Nickel, M. Schröder, and J. Steeg.
*Mid-term and short-term planning support for home health care services.*European Journal of Operational Research, 219(3), 574 - 587, 2012.

### 2011

- I. Correia, S. Nickel, and F. S. da Gama.
*Hub and spoke network design with single-assignment, capacity decisions and balancing requirements.*Applied Mathematical Modelling, 35(10), 4841 - 4851, 2011. - S. Gelareh and S. Nickel.
*Hub location problems in transportation networks.*Transportation Research Part E: Logistics and Transportation Review, 47(6), 1092 - 1111, 2011. - J. Grzybowski, S. Nickel, D. Pallaschke, and R. Urbanski.
*Ordered median functions and symmetries.*Optimization, 60(7), 801-811, 2011. - C. Heib and S. Nickel.
*Performancevergleich zwischen simulationsbasierter Online- und Offline-Optimierung anhand von Scheduling-Problemen.*In: L. März, W. Krug, O. Rose, and G. Weigert (editors), Simulation und Optimierung in Produktion und Logistik, VDI-Buch, 205-214. Springer Berlin, 2011. - M. Melo, S. Nickel, and F. Saldanha-da Gama.
*An efficient heuristic approach for a multi-period logistics network redesign problem.*TOP, 1-29, 2011. - J. Schuld, T. Schäfer, S. Nickel, P. Jacob, M. K. Schilling, and S. Richter.
*Impact of it-supported clinical pathways on medical staff satisfaction. a prospective longitudinal cohort study.*International Journal of Medical Informatics, 80(3), 151 - 156, 2011.

### 2010

- A. Beaudry, G. Laporte, T. Melo, and S. Nickel.
*Dynamic transportation of patients in hospitals.*OR Spectrum, 32(1), 77-107, 2010. - I. Correia, S. Nickel, and F. S. da Gama.
*The capacitated single-allocation hub location problem revisited: A note on a classical formulation.*European Journal of Operational Research, 207(1), 92 - 96, 2010. - I. Correia, S. Nickel, and F. S. da Gama.
*Single-assignment hub location problems with multiple capacity levels.*Transportation Research Part B: Methodological, 44(8-9), 1047 - 1066, 2010. - I. Correia, S. Nickel, and F. Saldanha-Da-Gama.
*Single-allocation hub location problems with capacity decisions and balancing requirements.*In: Proceedings of the 12th WSEAS international conference on Mathematical and computational methods in science and engineering, MACMESE'10, 51-56, Stevens Point, Wisconsin, USA, 2010. World Scientific and Engineering Academy and Society (WSEAS). - E. Fernández, J. Kalcsics, S. Nickel, and R. Z. Ríos-Mercado.
*A novel maximum dispersion territory design model arising in the implementation of the WEEE-directive.*Journal of the Operational Research Society, 61(3), 503-514, 2010. - S. Gelareh, S. Nickel, and D. Pisinger.
*Liner shipping hub network design in a competitive environment.*Transportation Research Part E: Logistics and Transportation Review, 46(6), 991 - 1004, 2010. - J. Kalcsics, S. Nickel, J. Puerto, and A. Rodríguez-Chía.
*The ordered capacitated facility location problem.*TOP, 18(1), 203-222, 2010. - J. Kalcsics, S. Nickel, J. Puerto, and A. M. Rodríguez-Chía.
*Distribution systems design with role dependent objectives.*European Journal of Operational Research, 202(2), 491 - 501, 2010. - K. Kraus, S. Nickel, R. Richter, M. K. Schilling, U. A. Schmidt, and J. Schuld.
*Klinische Behandlungspfade - Integration logistischer Planungsaufgaben.*Professional Process: Zeitschrift für modernes Prozessmanagement im Gesundheitswesen, 2(1), 12 - 15, 2010. - J. Krebs and S. Nickel.
*Extensions to the continuous ordered median problem.*Mathematical Methods of Operations Research, 71(2), 283-306, 2010. - A. Marín, S. Nickel, and S. Velten.
*An extended covering model for flexible discrete and equity location problems.*Mathematical Methods of Operations Research, 71(1), 125-163, 2010.

### 2009

- O. Berman, J. Kalcsics, D. Krass, and S. Nickel.
*The ordered gradual covering location problem on a network.*Discrete Applied Mathematics, 157(18), 3689 - 3707, 2009. - Z. Drezner and S. Nickel.
*Constructing a DC decomposition for ordered median problems.*Journal of Global Optimization, 45(2), 187-201, 2009. - Z. Drezner and S. Nickel.
*Solving the ordered one-median problem in the plane.*European Journal of Operational Research, 195(1), 46 - 61, 2009. - H. Hamacher and S. Nickel.
*Multifacility and restricted location problems multifacility and restricted location problems.*In: C. A. Floudas and P. M. Pardalos (editors), Encyclopedia of Optimization, 2409-2413. Springer US, 2009. - T. Hanne, T. Melo, and S. Nickel.
*Bringing robustness to patient flow management through optimized patient transports in hospitals.*Interfaces, 39(3), 241 - 255, 2009. - A. Marín, S. Nickel, J. Puerto, and S. Velten.
*A flexible model and efficient solution strategies for discrete location problems.*Discrete Applied Mathematics, 157(5), 1128 - 1145, 2009. - M. Melo, S. Nickel, and F. S. da Gama.
*Facility location and supply chain management - a review.*European Journal of Operational Research, 196(2), 401 - 412, 2009. - S. Nickel and F. Saldanha-da Gama.
*Logistics network design.*OR Spectrum, 31(3), 461-463, 2009. - S. Nickel and U.-A. Schmidt.
*Process improvement in hospitals: A case study in a radiology department.*Quality Management in Health Care, 18(4), 326 - 338, 2009.