Affiliation: | a Institut Gaspard-Monge, Université de Marne-la-Vallée, F-77454 Marne-la-Vallée Cedex 2, France b Department Computer Science, King's College London, London WC2R 2LS, UK c School of Computing, Curtin University of Technology, GPO Box 1987 U, Perth 6845, Western Australia d LNCIB, Area Science Park, Padriciano 99, Triesta, 34102, Italy |