Affiliation: | (1) Center of Operations Research, Miguel Hernández University, Edificio Torretamarit, Avda. Ferrocarril s. n., 03202 Elche (Alicante), Spain (e-mail: ana.meca@umh.es), ES;(2) Department of Statistics and OR, Faculty of Mathematics, Santiago de Compostela University, 15782 Santiago de Compostela, Spain (e-mail: ignacio@zmat.usc.es), ES;(3) Department of Econometrics, Tilburg University, P. O. Box 90153, 5000 LE Tilburg, The Netherlands (e-mail: P.E.M.Borm@kub.nl), NL |