Métodos de optimización exactos
y heurísticos para la resolución de nuevos modelos de
localización competitiva (MTM2015-70260-P)
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Investigadores /
Researchers | Resumen
| Summary | Resultados /
Results: artículos / papers | capítulos
de libro / chapters of books | libros
/ books | proceedings
| congresos / meetings
El proyecto de título "Métodos de optimización exactos y heurísticos para
la resolución de nuevos modelos de localización competitiva
(MTM2015-70260-P)" fue financiado por el Ministerio
de Economía, Industria y Competitivdad del Gobierno de España,
dentro del Plan
Estatal de Investigación Científica y Técnica y de Innovación
2013-2016, Programa Estatal de Fomento de la Investigación Científica y
Técnica de Excelencia, Subprograma Estatal de Generación de Conocimiento,
y por el Fondo
Europeo de Desarrollo Regional (FEDER), con un importe de 39325
euros. La duración del proyecto fue del 01/01/2016 al 30/09/2019.
The research project ''Exact and heuristic optimization methods for
solving new competitive facility location models (MTM2015-70260-P)'' was
funded by the Ministry
of Economy, Industry and Competitiveness of Spain,
within
the State
Plan for Scientific and Technical Research and Innovation
2013-2016, State Program for the Promotion of Scientific and Technical
Research of Excellence, State Subprogram for Knowledge Generation, and
by the European
Regional Development Fund (ERDF), with an amount
of 39325 euros. The duration of the
project was from 01/01/2016 to 09/30/2019.
INVESTIGADORES
/ RESEARCHERS
- José Fernández
Hernández (leader of the research project). University of Murcia.
Spain.
- Blas Pelegrín Pelegrín. University of Murcia. Spain.
- Pascual Fernández Hernández. University of Murcia. Spain.
- María Dolores García Pérez. San Antonio Catholic University of Murcia.
Spain.
- Boglárka G.-Tóth.
University of Szeged. Hungary.
- Algirdas Lancinskas. Vilnius
University. Lithuania.
- Julius Zilinskas.
Vilnius University. Lithuania.
- Said
Salhi. University of Kent. United Kingdom.
RESUMEN
DEL PROYECTO
Cuando una empresa desea abrir uno o varios
centros que ofrecerán un servicio que también es ofrecido por otras
empresas, la determinación de la localización de tales centros, y también
de sus características asociadas (su calidad), son fundamentales para
conseguir el éxito de la empresa. En este proyecto se propondrán nuevos
modelos matemáticos que persiguen maximizar el beneficio obtenido por la
empresa (o su cuota de mercado), y se diseñarán e implementarán métodos de
optimización para su resolución. Dependiendo del tipo de centro a ubicar,
se propondrán modelos discretos, en redes o continuos, en los que se
tendrán en cuenta distintos patrones de elección de centro por parte de
los consumidores. Se considerarán distintos tipos de posibles
restricciones, como la existencia de límites en la cantidad de bienes que
se pueden servir desde un determinado centro o la consecución de una cuota
de mercado (o beneficio) mínima. Se analizará la posible pérdida de cuota
de mercado (o beneficio) por parte de los centros ya existentes de la
empresa en expansión (canibalismo). También se estudiará la posibilidad de
que la empresa invierta no sólo en la ubicación de nuevos centros, sino
también en la variación de la calidad de los centros existentes,
contemplando incluso la posibilidad de cierre de algunos de estos.
Las técnicas de optimización que se
emplearán dependerán principalmente del espacio de localización donde se
puedan ubicar los nuevos centros. Para los problemas discretos se
intentará primeramente su linealización, para poder resolverlos con
técnicas de programación lineal entera. Cuando ello no se pueda realizar
de forma eficiente, se diseñarán tanto algoritmos exactos como heurísticos
(principalmente de tipo genético) para su resolución. Para los problemas
en redes se tratará inicialmente de discretizarlos, parapoder emplear así
las técnicas anteriores. Cuando ello no sea factible, se diseñarán métodos
exactos de tipo ramificación y acotación, y también técnicas heurísticas
de tipo genético. Los problemas continuos, por su parte, serán abordados
con técnicas de ramificación y acotación basadas en el análisis de
intervalos, en los que además de nuevos tests de eliminación y del estudio
de reglas de selección y de subdivisión, se incluirán algoritmos locales
para acelerar el test de corte. Para la resolución de problemas de gran
tamaño, se propondrán heurísticas, principalmente algoritmos evolutivos,
en los que se introducirán técnicas de eliminación de regiones no
prometedoras para concentrar así la búsqueda en las regiones con mayor
probabilidad de contener la solución. Para los problemas continuos en los
que la calidad de los centros a ubicar se considere como una variable
discreta, se modificarán los algoritmos anteriores para la resolución de
esos problemas de programación no lineal entera. Cuando los algoritmos
diseñados no permitan en sus versiones secuenciales la resolución de
problemas de tamaño real, se procederá a su paralelización.
El proyecto está relacionado con el reto
“Transporte sostenible, inteligente e integrado”, en lo concerniente al
tema de logística. También con el reto “Economía y sociedad digital”, en
relación con la prioridad temática “Aplicaciones y soluciones TIC”, puesto
que además de los modelos en sí y de los algoritmos de resolución, se
ofrecerán como entregables los códigos informáticos que permitirán a las
empresas aplicar los nuevos modelos de localización a su situación
particular.
PALABRAS CLAVE: localización competitiva;
optimización; algoritmos exactos; heurísticas; paralelización
SUMMARY
OF THE PROJECT
When a firm wants to open one or more
centers to offer a service already offered by other firms, determining the
location of those new centers, as well as their characteristics (eg.,
quality) is of major concern for the success of the firm. In this research
project new mathematical models will be proposed whose aim is to maximize
the profit obtained by the firm (or its captured market share);
optimization methods will be designed and implemented for their
resolution. Depending on the type of center to set up, discrete, network
or continuous models will be proposed, which will consider different
patronizing behavior of customers. In addition, practical constraints
related to the maximum amount of goods that can be available from a given
facility, or the requirement that the new facilities will get at least a
minimum level of market share (or profit), among others, will be
considered. The loss in market share (or profit) suffered by the existing
firm-owned facilities will also be studied, including the possibility of
using the budget available from the firm not only in the location of new
facilities, but in varying the quality of existing centers as well. This
may include the possibility of closing down some of the older facilities.
The optimization techniques employed will
depend mainly on the location space where the new facilities can be
located. For the discrete problems, linearization techniques will be
explored first, in order to solve those problems with integer linear
programming tools. Exact and heuristic based techniques such as genetic
algorithms will be also designed for solving those problems that could not
be linearized efficiently. For network problems, discretization techniques
will be studied first, but in case this methodology may not be powerful
enough, we intend to design exact branch-and-bound methods as well as
genetic algorithms. As for the continuous problems, they will be solved
with branch-and-bound methods based in interval analysis tools that we aim
to revisit and extend. New discarding tests will be developed, as well as
new selection and division rules. New local searches will be adapted and
embedded into the search to accelerate the cut-off test. Heuristic methods
will be proposed to cope with large size problems focusing on evolutionary
algorithms, where discarding tests of non-promising areas will be
developed to focus the search in the promising regions with a higher
probability for containing the optimal solution. In the continuous
problems in which the quality of the new facility is considered to be a
discrete variable, the methods will be adapted to cope with those mixed
integer nonlinear programming problems. In case the algorithms are not
able to solve real size problems due to their sequential implementations,
parallel implementations will be proposed. The research project is related
with the following two challenges, namely, the challenge “Integrated,
smart and sustainable transport”, which has a logistical focus area, and
the challenge “Economy and digital society”, as related to the priority
area “Applications and ICT solutions”. In addition to solving these
location models, the codes to solve the corresponding problems will be
made available as part of the outputs of the research project to those
interested firms. We would be also happy to provide training in the
University or in the company sites so to those staff can use them to solve
their own location problems.
KEY WORDS: competitive location;
optimization; exact algorithms; heuristics; parallelization
RESULTADOS DEL PROYECTO / PROJECT
RESULTS
ARTÍCULOS
/ PAPERS
- A. Elshaikh, S. Salhi, J. Brimberg, N. Mladenovic, B. Callaghan and G.
Nagy (2016), An adaptive perturbation-based heuristics: Application to
the continuous p-center problem, Computers and Operations Research 75,
1-11 (doi: 10.1016/j.cor.2016.04.018).
- A. Lančinskas, P. Fernández , B. Pelegrín and J. Žilinskas (2016),
Solution of Discrete Competitive Facility Location Problem for Firm
Expansion, INFORMATICA 27, 451-462 (doi: 10.15388/Informatica.2016.94).
- B. Pelegrín, P. Fernández and J.D. Pelegrín (2016), On the location of
new routes to a destination for airline expansion, European Journal of
Industrial Engineering 10, 664-281 (doi: 10.1504/EJIE.2016.078806).
- C.A.Irawan, S. Salhi and Z. Drezner (2016), Hybrid Meta-heuristics
with VNS and Exact Methods: Application to Large Unconditional and
Conditional Vertex p-Centre Problems, Journal of Heuristics 22,
507-537 (doi: 10.1007/s10732-014-9277-7).
- J.L. Redondo, J. Fernández and P.M. Ortigosa,
FEMOEA: a Fast and Efficient Multi-Objective Evolutionary
Algorithm. Mathematical Methods of
Operations Research 85 (2017) 113-135, (doi:10.1007/s00186-016-0560-2).
- J. Fernández, B. G.-Tóth,
J.L. Redondo, P.M. Ortigosa,
A.G. Arrondo, A
planar single-facility competitive location and design problem under
the multi-deterministic choice rule. Computers and
Operations Research 78 (2017) 305-315 (doi: 10.1016/j.cor.2016.09.019).
- P. Fernández, B. Pelegrín, A. Lančinskas, J. Žilinskas (2017), New
heuristic algorithms for discrete competitive location problems with
binary and partially binary customer behavior, Computers and Operations
Research 79, 12-18 ( 10.1016/j.cor.2016.10.002).
- B. Callaghan, S. Salhi and G. Nagy (2017), Speeding up the optimal
method of Drezner for the p-center problem in the plane, European
Journal of Operational Research 257, 722-734 (doi: 10.1016/j.ejor.2016.08.038).
- C. Irawan, S. Salhi and L.Martino, N. Azizi (2017), The Continuous
single source capacitated location problem with and without capacity and
zone-dependent fixed cost, European Journal of Operational Research 263,
94-107 (doi: 10.1016/j.ejor.2017.04.004).
- A. Lančinskas, P. Fernández , B. Pelegrín and J. Žilinskas (2017) ,
Improving solution of discrete competitive facility location problems,
Optimization Letters 11, 259-270 (doi: 10.1007/s11590-015-0930-3).
- B. Pelegrín, P. Fernández, M.D. García (2018), Computation of
multi-facility location Nash equilibria on a network under quantity
competition, Networks and Spatial Economics 18, 999 – 1017 (doi: 10.1007/s11067-019-09463-8)
- J. Fernández, B. G.-Tóth, J.L. Redondo, P.M. Ortigosa (2019), The probabilistic customer's choice
rule with a threshold attraction value: effect on the location of
competitive facilities. Computers and Operations
Research 101,234-249. (doi: https://doi.org/10.1016/j.cor.2018.08.001)
- B. Pelegrín, P. Fernández, J.D. Pelegrín, M.D. García (2019),
Threshold distance versus side payment to reduce the cannibalization
effect in retail chain expansión, IMA Journal of Management Mathematics
30, 105-123 (doi: 10.1093/imaman/dpx011)
- B. Callaghan, S. Salhi, J. Brimberg (2019), Optimal solutions for the
continuous p-centre problem and related α-neighbour and conditional
problems: A relaxation-based algorithm, Journal of the Operational
Research Society 70, 192-211 (doi:
10.1080/01605682.2017.1421854)
- Z. Drezner, P. Kalczynski, S. Salhi (2019), The planar multiple
obnoxious facilities location problem: A Voronoi based heuristic, Omega
87, 105-116, (doi: 10.1016/j.omega.2018.08.013)
- C.A. Irawan, M. Luis, S. Salhi, A. Imran (2019) The
incorporation of fixed cost and multilevel capacities into the discrete
and continuous single source capacitated facility location problem,
Annals of Operations Research 275, 367-392 (doi: 10.1007/s10479-018-3014-9).
- E.
Filatovas, O. Kurasova, J.L. Redondo, J. Fernández (2020),
A reference point-based evolutionary algorithm for approximating
regions of interest in multiobjective problems, Top
(to appear), (doi: https://doi.org/10.1007/s11750-019-00535-z
)
-
M.D. García and B. Pelegrin (2020),
Exact equilibrium
quantities in spatially separated markets under production
constraints, Journal of Interdisciplinary Mathematics (to
appear) (doi:
https://doi.org/10.1080/09720502.2020.1741220)
CAPÍTULOS
DE LIBRO / CHAPTERS OF BOOKS
- A. Lančinskas, P. Fernández, B. Pelegrín, J. Žilinskas (2016).
Estimating the Pareto Front of a Hard Bi-criterion Competitive Facility
Location Problem. En “Advances in Stochastic and Deterministic
Global Optimization”, Springer Optimization and Its Applications 107.
Editado por P.M. Pardalos, A. Zhigljavsky and J. Žilinskas. Capítulo 14,
255-272. Springer. ISBN 978-3-319-29973-0, 978-3-319-29975-4 (doi:
10.1007/978-3-319-29975-4_14).
- B. Pelegrín, P. Fernández and M.D. García (2017). Nash equilibria in
network facility location under delivered prices. En “Spatial
interaction models: Facility location using game theory”, Springer
Optimization and Its Applications 118. Editado por L. Mallozzi, E.
D’Amato, P.M. Pardalos. Capítulo 13, 273-292. Springer. ISBN
978-3-319-52654-6, 978-3-319-52653-9 (doi: 10.1007/978-3-319-52654-6_13)
- J. Fernández, J.L. Redondo, P.M. Ortigosa, B.G.-Tóth (2017), Huff-like Stackelberg location problems
on the plane, in "Spatial
Interaction Models - Facility location using game theory", (Edited
by L. Mallozzi, E. D'Amato, P.M. Pardalos), Springer Optimization and
Its Applications 118, Springer (ISBN 978-3-319-52654-6,
978-3-319-52653-9,
DOI 10.1007/978-3-319-52654-6_7), pp. 129-169.
- P. Fernández, B. Pelegrín, A. Lancinskas, J. Zilinskas (2018), The
Huff versus the Pareto-Huff customer choice rules in a discrete
competitive location model. In Lecture Notes in Computer Science 10961:
Computational Science and Its Applications Part II. ICCSA 2018. Springer
International Publishing (ISBN 978-3-319-95164-5), 583 – 592 (doi: 10.1007/978-3-319-95165-2_41)
- B. G.-Tóth, L. Anton-Sanchez, J. Fernández, J.L. Redondo and P.M.
Ortigosa (2020), A
continuous competitive facility location and design problem for firm
expansion, in "Optimizacion
of complex systems: theory, models, algorithms and applications",
(Edited by H.A. Le Thi, H.M. Le and T. Pham Dinh), Advances in
Intelligent Systems and Computing 991, Springer (ISBN 978-3-030-21802-7,
978-3-030-21803-4, DOI:
10.1007/978-3-030-21803-4_100),
pp. 1013-1022.
LIBROS / BOOKS
- A.G. Arrondo, J. Fernández, J.L. Redondo and P.M. Ortigosa, Evolutionary
algorithms
applied to competitive facility location - sequential and parallel
implementations for single and multi-objective models, Lambert
Academic
Publishing, 2016 (128 pages), ISBN: 978-3-659-89601-9.
PROCEEDINGS
- A. Lančinskas, P. Fernández, B. Pelegrín, J. Žilinskas (2019).
Ranking-based algorithm for facility location with constraints. AIP
Conference Proceedings 2070, 020030; https://doi.org/10.1063/1.5089997
PONENCIAS
EN CONGRESOS / TALKS IN MEETINGS
- E. Filatovas, J.L. Redondo, J. Fernández, O. Kurasova. NSGA-NBI: a
preference based multi-objective evolutionary algorithm. Euro 2016,
Poznan (Poland), 3-6 July, 2016.
- J. Žilinskas A. Lančinskas, P. Fernández, B. Pelegrín. Ranking
based heuristic algorithm for discrete competitive facility location
problems. Euro 2016, Poznan (Poland), 3–6 July 2016.
- S. Salhi. Enhancement of the Drezner optimal method for the continuous
p-centre problem. Euro 2016, Poznan (Poland), 3–6 July 2016.
- B. Pelegrín, P. Fernández, M.D. García and J.D. Pelegrín, A
mathematical model for planning store location in the franchise
industry. VII European Congress of Mathematics, Berlín (Germany), 18-22
July, 2016.
- J. Fernández, J.L. Redondo, P.M. Ortigosa, B.G.-Tóth. A Huff-like
single facility location and design problem with closing and/or
modification of existing facilities. International Conference on
Management and Operations Research, Beijing (China), 12-14 August, 2016.
- P. Fernández, B. Pelegrín, A. Lancinskas, J. Zilinskas, New heuristic
algorithms for discrete competitive location problems with different
customer behavior. International Conference on Management and Operations
Research, Beijing (China), 12-14 August, 2016.
- E. Filatovas, O. Kurasova, J.L. Redondo, J. Fernández. A
preference-based multi-objective evolutionary algorithm for
approximating the region of interest. XIII Global Optimization Workshop,
Braga (Portugal), 4-8 September, 2016.
- J. Fernández, B.G.-Tóth, J.L. Redondo, P.M. Ortigosa. Locating a
facility with the partially probabilistic choice rule. XIII Global
Optimization Workshop, Braga (Portugal), 4-8 September, 2016.
- J. Fernández, J.L. Redondo, P.M. Ortigosa, B.G.-Tóth. A continuous
competitive facility location model with attractiveness adjustment of
the existing facilities. XXIII Euro Working Group on Locational Analysis
(EWGLA23), Málaga (Spain), 14-16 September, 2016.
- B. Pelegrín, P. Fernández, J.D. Pelegrín. Finding new routes to a
destination for airline revenue maximization. XXIII Euro Working Group
on Locational Analysis (EWGLA23), Málaga (Spain), 14-16 September, 2016.
- B. Pelegrín, P. Fernández, J. Zilinskas, A. Lanzinskas. Discrete
competitive location problems with different customer behavior and
additional constraints. XXIII Euro Working Group on Locational Analysis
(EWGLA23), Málaga (Spain), 14-16 September, 2016.
- J. Fernández, J.L. Redondo, P.M. Ortigosa, B.G. Tóth. Chain expansion:
deciding the location and design of a new facility and/or the
modification of the quality or closing of existing facilities. IV
International Workshop on Competitive Location, Murcia (Spain), 28-30
May, 2017.
- P. Fernández, B. Pelegrín, A. Lancinskas, J. Zilinskas, Discrete
competitive location problems with additional constraints. IV
International Workshop on Competitive Location, Murcia (Spain), 28-30
May, 2017.
- B. Pelegrín, P. Fernández and M.D. García, How to find Nash equilibria
in location games. IV International Workshop on Competitive Location,
Murcia (Spain), 28-30 May, 2017.
- A. Lancinskas, J. Zilinskas, Heuristic algorithms for discrete
competitive facility location problems. IV International Workshop on
Competitive Location, Murcia (Spain), 28-30 May, 2017.
- B.G.-Tóth, J. Fernández. MINLP feladatok megoldása intervallumus
B&B módszerrel, Magyar Operációkutatási Konferencia, Cegléd
(Hungary), 14-16 June, 2017.
- J. Fernández, J.L. Redondo, P.M. Ortigosa, B.G. Tóth. A
MINLP model for locating a competitive facility in the plane when
attractiveness adjustment and/or closing of the existing chain-owned
facilities is allowed. 21st Conference of the International
Federation of Operational Research Societies (IFORS21), Québec City
(Canada), 17-21 July, 2017.
- P. Fernández, B. Pelegrín, A. Lancinskas, J. Zilinskas, A discrete
competitive location problem with additional constraints. 21st
Conference of the International Federation of Operational Research
Societies (IFORS21), Québec City (Canada), 17-21 July, 2017.
- J. Zilinskas, A. Lancinskas, B. Pelegrín, P. Fernández, Ranking based
heuristic algorithm for discrete competitive facility location problems.
21st Conference of the International Federation of Operational Research
Societies (IFORS21), Québec City (Canada), 17-21 July, 2017.
- B. Pelegrín, P. Fernández, M.D. García, The follower location choice
under quantity competition. 21st Conference of the International
Federation of Operational Research Societies (IFORS21), Québec City
(Canada), 17-21 July, 2017.
- A. Lancinskas, J. Zilinskas, P. Fernández, B. Pelegrín, Ranking-based
random search algorithm for discrete competitive facility location.
Optimization 2017, Lisbon (Portugal), 6-8 September, 2017.
- J. Fernández, S. Salhi, B.G. Tóth, A
location-price game for locating a competitive facility in the plane,
XII International Conference on Game Theory and Management, Saint
Petersburg (Russia), 27-29 June 2018.
- B. Pelegrín, P. Fernández, M.D. García, Optimal multi-facility
location for competing firms under quantity competition. International
Symposium on Mathematical Programming, Bourdeaux (Francia), 1-6 July,
2018.
- P. Fernández, B. Pelegrín, A. Lancinskas, J. Zilinskas, The Huff
versus the Pareto-Huff Customer Choice Rules in a Discrete Competitive
Location Model. 18th International Conference on Computational Science
and Its Applications, ICCSA 2018, Melbourne (Australia), 2-5 July, 2018.
- L. Simeonova, N. Wassan, S. Salhi, An integrated mixed method
approach for decision making in a multi-facility supply chain: a real
life case from the UK steel industry, 29th Conference on
Operational Research (EURO 2018), Valencia (Spain), 8-11 July 2018.
- A. Lancinskas, J. Zilinskas, P. Fernández, B. Pelegrín, Ranking-based
heuristic algorithm for competitive facility location. 29th European
Conference on Operational Research (EURO 2018), Valencia (Spain), 8-11
July, 2018.
- S. Salhi, C. Irawan, M. Abdulrahman, Compromise programming for
closed loop supply chain networks, 29th Conference on Operational
Research (EURO 2018), Valencia (Spain), 8-11 July 2018.
- B.G. Tóth, J. Fernández, J.L. Redondo, P.M. Ortigosa, An
interval branch-and-bound method for solving a MINLP competitive
facility location and design problem, 16th EUROPT Workshop on
Advances in Continuous Optimization (EUROPT2018), Almería (Spain), 12-13
July 2018.
- L. Antón-Sánchez, J.L. Redondo, J. Fernández, P.M. Ortigosa, A
heuristic algorithm for solving a competitive facility location and
design MINLP problem, 16th EUROPT Workshop on Advances in
Continuous Optimization (EUROPT2018), Almería (Spain), 12-13 July 2018.
- A. Lancinskas, J. Zilinskas, P. Fernández, B. Pelegrín, Ranking-based
algorithm for facility location with constraints. XIV Global
Optimization Workshop (LeGO 2018), Leiden (The Netherlands), 18-21
September, 2018.
- A. Lancinskas, J. Zilinskas, P. Fernández, B. Pelegrín, Ranking-based
algorithm for discrete facility location. 10th International Workshop on
Data Analysis Methods for Software Systems, Druskininkai (Lithuania), 29
November-1 December, 2018.
- B. Pelegrín, P. Fernández, M.D. García, Finding location Nash
equilibrium for firms competing with Cournot quantities. Joint Meeting
of "12th Int. ISDG Workshop" and "13th Int. Conference on Game
Theory and Management" (ISDG12-GTM2019), San Petersburgo (Rusia), 3-5
July, 2019.
- B. Pelegrín, P. Fernández, M.D. García, On the existence of location
Nash equilibria under delivered prices and price sensitive demand: an
empirical study. Joint Meeting of "12th Int. ISDG Workshop" and "13th
Int. Conference on Game Theory and Management" (ISDG12-GTM2019), San
Petersburgo (Rusia), 3-5 July, 2019.
- B.G. Tóth, L. Antón-Sánchez, J. Fernández, J.L. Redondo, P.M.
Ortigosa, A continuous competitive facility location and design
problem for firm expansion, 6th World Congress on Global
Optimization (WCGO 2019), Metz (France), 8-10 July 2019.
- J. Fernández, B.G. Tóth, L. Antón-Sánchez, J.L. Redondo, P.M.
Ortigosa, Firm expansion: how to invest? A MINLP model and B&B
and heuristic procedures to deal with it, Sixth International
Conference on Continuous Optimization, Berlin (Germany), 5-8 August
2019.
- L. Antón-Sánchez, B.G. Tóth, J. Fernández, J.L. Redondo, P.M.
Ortigosa, A heuristic algorithm for solving a competitive facility
location and design MINLP problem for firm expansion, XXXVIII
Congreso Nacional de Estadística e Investigación Operativa (SEIIO
XXVIII), Alcoy (Spain), 3-6 September 2019.