[1] Univ Lisbon, Dept Stat & Operat Res, P-1749016 Lisbon, Portugal
[2] Univ Lisbon, Ctr Operat Res, P-1749016 Lisbon, Portugal
[3] Univ Appl Sci, Dept Business Adm, D-66123 Saarbrucken, Germany
[4] Fraunhofer Inst Ind Math ITWM, Dept Optimizat, D-67663 Kaiserslautern, Germany
[5] Univ Saarland, Chair Operat Res & Logist, D-66041 Saarbrucken, Germany