**A feasible rounding approach for mixed-integer optimization problems [in press]**.

Neumann, C.; Stein, O.; Sudermann-Merx, N.

2019. Computational optimization and applications. doi:10.1007/s10589-018-0042-y

**Coercive polynomials: stability, order of growth, and Newton polytopes [in press]**.

Bajbar, T.; Stein, O.

2019. Optimization, 1–26. doi:10.1080/02331934.2018.1426585

**Global optimization of generalized semi-infinite programs using disjunctive programming**.

Kirst, P.; Stein, O.

2019. Journal of global optimization, 73 (1), 1–25. doi:10.1007/s10898-018-0690-6

**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

**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

**On the length of copula level curves**.

Coblenz, M.; Grothe, O.; Schreyer, M.; Trutschnig, W.

2018. Journal of multivariate analysis, 167, 347–365. doi:10.1016/j.jmva.2018.06.001

**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

**Grundzüge der Nichtlinearen Optimierung**.

Stein, O.

2018. Springer, Berlin. doi:10.1007/978-3-662-55593-4

**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, Cham. doi:10.1007/978-3-319-89920-6_93

**Reduced and Minimally Convex Pairs of Sets [in press]**.

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

2018. Journal of convex analysis, 25 (4)

**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

**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

**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. Karlsruhe. doi:10.5445/IR/1000075947

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

Brandt, F.

2017. Karlsruhe. 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

**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, Cham. doi:10.1007/978-3-319-28697-6_33

**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

**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, Washington, D.C

**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

**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. Karlsruhe. 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

**Operations Research: Mathematical Methods**.

Bäuerle, N.; Stein, O.

2015. Wiley StatsRef: Statistics Reference Online. Ed.: N. Balakrishnan, 1–8, John Wiley & Sons, Ltd, Chichester, UK. doi:10.1002/9781118445112.stat04584.pub2

**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), 1–12. 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, Berlin. 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

**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. 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 - Product-Service Systems und Produktivität. Hrsg.: O. Thomas, 291–304, Springer, 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

**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; Festschrift zum 60. Geburtstag von Brigitte Werners. Hrsg.: K. Armborst, 69–88, Kovač, Hamburg

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

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

2013. TU Eindhoven, Research School for Operations Management and Logistics (BETA), 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. Karlsruhe

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

Ebermann, E.

2013. Karlsruhe

**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, Berlin. 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, Hamburg

**Cephoids: Duality and Reference Vectors**.

Pallaschke, D.; RosenmŸller, J.

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

**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

**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, Stevens Poins (WI)

**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, Karlsruhe. 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., Providence (RI)

**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, Aachen

**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, New York (NY). 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

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

Drezner, Z.; Nickel, S.

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