## Submitted Papers

- C. Ortiz-Astorquiza, I. Contreras, G. Laporte, “ Multilevel facility location problems ”,
*submitted to European Journal of Operational Research*, 2017. - C. Ortiz-Astorquiza, I. Contreras, G. Laporte, “ An exact algorithm for multi-level uncapacitated facility location ”,
*submitted to Transportation Science*, 2017. - W. Nassief, I. Contreras, B. Jaumard, “ A comparison of formulations and relaxations for cross-dock door assignment problems ”,
*submitted to Computers and Operations Reseaerch*, 2017. - W. Nassief, I. Contreras, M. Guignard, P. Hahn, B. Jaumard, “ The container scheduling and cross-dock door selection problem ”,
*submitted to International Journal of Production Research*, 2017. - A. Acevedo-Ojeda, I. Contreras, M. Chen, “ Two-level lot-sizing with raw-material perishability and deterioration ”,
*submitted to International Journal of Production Research*, 2017. - M. Tohidi, M. Kazemi Zanjani, I. Contreras, “ Integrating Physician and Clinic Scheduling in Ambulatory Polyclinics ”,
*submitted to Journal of the Operational Research Society*, 2017. - C.A. Zetina, I. Contreras, J.F. Cordeau, E. Nikbakhsh, “ Robust uncapacitated hub location”,
*submitted to Transportation Research Part B*, 2016. - A. Alibeyg, I. Contreras, E. Fernández, “Exact solution of hub network design problems with profits”,
*submitted to European Journal of Operational Research*, 2016. - F. Enderer, C. Contardo, I. Contreras, “Integrating dock-door assignment and vehicle routing in cross-docking ”,
*submitted to Computers and Operations Research*, 2015.

## Publications

- C. Ortiz-Astorquiza, I. Contreras, G. Laporte, “Formulations and approximation algorithms for multi-level uncapacitated facility location ”,
*INFORMS Journal on Computing*, in press, 2017. - M. Tanash, I. Contreras, N. Vidyarthi, “An exact algorithm for the modular hub location problem ”,
*Computers and Operations Research*, in press, 2017. - A. Alibeyg, I. Contreras, E. Fernández, “Hub network design problems with profits”,
*Transportation Research Part E*, 96, 40-59, 2016. - I. Contreras, M. Tanash, N. Vidyarthi, “Exact and heuristic approaches for the cycle hub location problem”,
*Annals of Operations Research*, articles in advance, 2016. - W. Nassief, I. Contreras, R. As'ad, “A Mixed-Integer Programming formulation and Lagrangean relaxation for the cross-dock door assignment problem”,
*International Journal of Production Research*, 54(2), 494-508, 2016. - C. Ortiz-Astorquiza, I. Contreras, G. Laporte, “Multi-level facility location as the maximization of a submodular set function”,
*European Journal of Operational Research*, 247, 1013-1016, 2015. - E. Martins de Sa, I. Contreras, J.F. Cordeau, R. de Camargo, G. Miranda, “The hub line location problem”,
*Transportation Science*, 49, 500-518, 2015. - E. Martins de Sa, I. Contreras, J.F. Cordeau, “Exact and heuristic algorithms for the design of hub networks with multiple lines”,
*European Journal of Operational Research*, 246, 186-198, 2015. - C. Ortiz, I. Contreras, G. Laporte, “The minimum flow cost Hamiltonian cycle problem: a comparison of formulations”,
*Discrete Applied Mathematics*, 187, 140-154, 2015. - I. Contreras, “Hub location problems”, in
*Location Science*, (Eds.) G. Laporte, S. Nickel, F. Saldanha-da-Gama, Springer, 2015. - I. Contreras, E. Fernández, “Hub location as the minimization of a supermodular set function”,
*Operations Research*, 62, 557-570, 2014. - A. Alibeyg, I. Contreras, E. Fernández, “A lagrangean relaxation for uncapacitated hub location problems with profits”,
*Conference Proceedings of the CLAIO*, in press, 2014. - I. Contreras, J.F. Cordeau, G. Laporte, “Exact solution of large-scale hub location problems with multiple capacity levels”,
*Transportation Science*, 46, 439-459, 2012. - I. Contreras, E. Fernández, “General network design: A unified view of combined location and network design problems”,
*European Journal of Operational Research*219, 680-697, 2012. - I. Contreras, E. Fernández, G. Reinelt “Minimizing the maximum travel time in a combined model of facility location and network design”,
*Omega*40, 847-860, 2012. - I. Contreras, J.F. Cordeau, G. Laporte, “Benders decomposition for large-scale uncapacitated hub location”,
*Operations Research*59, 1477-1490, 2011. - I. Contreras, J.F. Cordeau, G. Laporte, “Stochastic uncapacitated hub location”,
*European Journal of Operational Research*212, 518-528, 2011. - I. Contreras, J.F. Cordeau, G. Laporte, “The dynamic uncapacitated hub location problem”,
*Transportation Science*45, 18-32, 2011. - I. Contreras, J.A. Díaz, E. Fernández, “Branch and price for large-scale capacitated hub location problems with single assignment”,
*INFORMS Journal on Computing*23, 41-55, 2011. - I. Contreras, E. Fernández, A. Marin “Lagrangean bounds for the optimum communication spanning tree problem”
*TOP*18, 140-157, 2010. - I. Contreras, E. Fernández, A. Marin “The tree of hubs location problem”,
*European Journal of Operational Research*202, 390-400, 2010. - I. Contreras, E. Fernández, A. Marin “Tight bounds from a path based formulation for the tree of hubs location problem”,
*Computers and Operations Research*36, 3117-3127, 2009. - I. Contreras, J.A. Díaz, E. Fernández, “Lagrangean relaxation for the capacitated hub location problem with single assignment
*”, OR Spectrum*31, 483-505, 2009. - I. Contreras, J. Díaz, “Scatter search for the single source capacitated facility location problem”,
*Annals of Operations Research*157, 73-89, 2008.

## Presentations in International Conferences

- A. Alibeyg, I. Contreras, E. Fernández, “Hub location with profits”, 26th Joint INFORMS- EURO International Conference, Rome, Italy, July 2013.
- I. Contreras, F. Mirzaghafour, “The modular hub location problem”, 26th Joint INFORMS- EURO International Conference, Rome, Italy, July 2013.
- M. Tanash, I. Contreras, N. Vidyarthi, “The cycle hub location problem”, Optimization Days 2013, Montreal, Canada, May 2013.
- C. Ortiz, I. Contreras, G. Laporte, “The minimum flow cost Hamiltonian tour problem”, Optimization Days 2013, Montreal, Canada, May 2013.
- A. Alibeyg, I. Contreras, E. Fernández, “Hub location with profits”, Optimization Days 2013, Montreal, Canada, May 2013.
- B. Hosseini, I. Contreras, S. Chauhan, “The modular hub location problem”, Optimization Days 2013, Montreal, Canada, May 2013.
- E. Martins de Sa, I. Contreras, J.F. Cordeau, R. de Camargo, G. Miranda, “The hub line location problem”, Optimization Days 2013, Montreal, Canada, May 2013.
- I. Contreras, E. Fernández, “ Hub location as the minimization of a supermodular set function ”, 25th European conference on operational research, Vilnius, Lithuania, July 2012.
- I. Contreras, E. Fernández, “ Branch and price for hub location problems with single assignment ”, International workshop on column generation 2012, Bromont, Canada, June, 2012.
- I. Contreras, E. Fernández, “Supermodular properties in hub location ”, Optimization days 2012, Montreal, Canada, May 2012.
- I. Contreras, J.F. Cordeau, G. Laporte, “Exact solution of large-scale hub location problems with multiple capacity levels”, XIX European working group in locational analysis meeting, Nantes, France, October 2011.
- I. Contreras, J.F. Cordeau, G. Laporte, “Recent developments in hub location”, CIRRELT Conference 2011, Montreal, Canada, May 2011.
- I. Contreras, J.F. Cordeau, G. Laporte, “Stochastic uncapacitated hub location”, Optimization days 2011, Montreal, Canada, May 2011.
- I. Contreras, J.F. Cordeau, G. Laporte, “The dynamic uncapacitated hub location problem”, 24th European conference on operational research, Lisbon, Portugal, July 2010.
- I. Contreras, J.F. Cordeau, G. Laporte, “Benders decomposition for large-scale uncapacitated hub location”. Seventh triennial symposium on transportation analysis, Tromso, Norway, June 2010.
- I. Contreras, J.F. Cordeau, G. Laporte, “The dynamic uncapacitated hub location problem”, Optimization days 2010, Montreal, Canada, May 2010.
- I. Contreras, E. Fernández, A. Marin, “The tree of hubs location problem”, Optimization days 2009, Montreal, Canada, May 2009.
- I. Contreras, E. Fernández, A. Marin, “Models and algorithms for the optimum communication spanning tree problem”, Euro working group in locational analysis 2008, Elche, Spain, September 2008.
- I. Contreras, J.A. Díaz, E. Fernández, “An exact branch and price algorithm for the capacitated hub location problem with single assignment”, International symposium on locational decisions, Santa Barbara, United States, June 2008.
- I. Contreras, E. Fernández, A. Marin, “Models and algorithms for the optimum communication spanning tree problem”, International workshop on operational research 2008, Madrid, Spain, June 2008.
- I. Contreras, J.A. Díaz, E. Fernández, “A column generation approach for the capacitated single allocation hub location problem”, Workshop in hub location, Trippstadt, Germany, September 2007.
- I. Contreras, J.A. Díaz, E. Fernández, “A Lagrangean relaxation approach for the capacitated single allocation hub location problem”, Meeting of the thematic network: Analysis and applications decisions on locations of services and related problems, Baeza, Spain, Mars 2007.
- I. Contreras, J.A. Díaz, E. Fernández, “A Lagrangean relaxation approach for the capacitated single allocation hub location problem”, Euro winter institute in location and logistics 2007, Estoril, Portugal, January 2007.
- I. Contreras, J.A. Díaz, “Scatter search for the single source capacitated facility location problem”, XII Latin-iberoamerican congress in operations research and systems, La Habana, Cuba, October 2004.