Affiliation: | 1. School of Computer Science, University of Nottingham, Jubilee Campus, Wollaton Road, Nottingham?, NG8 1BB, UK 2. Laboratory for Analysis and Architecture of Systems, National Center of Scientific Research, 7 avenue du Colonel Roche, 31077?, Toulouse, France 3. Montpellier University LIRMM, UMR 5506, 161 rue Ada, 34392?, Montpellier Cedex 5, France 4. University of Technology of Troyes, 12, rue Marie Curie, BP 2060, 10010?, Troyes cedex, France
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