State Management in Distributed Virtual Environments: A Voronoi Based Approach L.Genovali, L.Ricci STATE MANAGEMENT IN DISTRIBUTED VIRTUAL ENVIRONMENTS: A VORONOI BASED APPROACH Laura Ricci, Luca Genovali Department of Computer Science University of Pisa, Italy INTERNATIONAL CONGRESS ON ULTRA MODERN COMMUNICATIONS AND CONTROL SYSTEMS MOSCOW, 18-20 OCTOBER 2010