Affiliation: | (1) LAMSADE, Universit? Paris Dauphine, Place du Mar?chal de Lattre de Tassigny, F-75775 Paris Cedex 16, France;(2) DEIS, Universit? di Bologna, Viale Risorgimento 2, 40136 Bologna, Italy;(3) MOSI, Department of Mathematics, Operational Research, Statistics and Information Systems for Management, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium |