Affiliation: | 1. LiSSi Laboratory, Department of Network and Telecommunication, IUT Creteil/Vitry, University of Paris 12-Val de Marne, 122, rue Paul Armangot, 94400, Vitry sur seine, France 2. Network Systems Laboratory, Department of Computer Science and Information Technology, University of the District of Columbia, 4200, Connecticut Avenue, N.W., Washington, DC, 20008, USA 3. IBM Zurich Research Laboratory, Saeumerstr. 4, CH-8803, Rueschlikon, Switzerland
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