Affiliation: | (1) Dipartimento di Scienze dell'Informazione, University of Milano, Via Comelico, 39/41, 20135 Milano, Italy;(2) Department of Computer Sciences, Purdue University, West Lafayette, IN 47907, USA;(3) LISI—UFR d'Informatique, University Claude Bernard Lyon 1, 8, blvd Niels Bohr, 69622 Villeurbanne, France |