[1] Univ Florence, Dipartimento Ingn Informaz, Operat Res, Florence, Italy
[2] Univ Wisconsin, Dept Ind & Syst Engn, Madison, WI USA
[3] CentraleSupelec, Lab Genie Ind, Paris, France
[4] Katholieke Univ Leuven, Louvain, Belgium
[5] Univ Florence, Dipartimento Ingn Ind, Florence, Italy