1. University of L’Aquila,Computer Science and Mathematics,Department of Information Engineering,L’Aquila,Italy
2. QUARTZ Laboratory, EA7393, ENSEA, 6 Avenue du Ponceau,Cergy-Pontoise,France,95014
3. LS2N-UMR 6004-CNRS, Centrale Nantes,1 Rue de la Noë,Nantes,France,44300