1. Graduate School of Informatics and Engineering, The University of Electro-Communications,Tokyo,Japan,1828585
2. University of Picardy Jules Verne,MIS Lab,Amiens,France,80000
3. University of Clermont Auvergne,Laboratory of Computer Science, Modelling and Systems Optimisation,Clermont-Ferrand,France,63178
4. Cyberscience Center, Tohoku University,Sendai,Japan,9808578