First Author:   Dinko Dimitrov CentER and Department of Econometrics and Operations Research, Tilburg University, The Netherlands d.a.dimitrov@uvt.nl         Second Author: Stef Tijs CentER and Department of Econometrics and Operations Research, Tilburg University, The Netherlands s.h.tijs@uvt.nl         Third Author: Rodica Branzei Faculty of Computer Science, Alexandru Ioan Cuza University, Iasi, Romania branzeir@infoiasi.ro