1. Complex Systems Group, Department of Signal Theory and Communications, Universidad Rey Juan Carlos, Fuenlabrada, 28943 Madrid, Spain
2. Embassy of Italy in Tel Aviv, 25 Hamered St., 68125 Tel Aviv, Israel
3. CNR- Istituto dei Sistemi Complessi, Via Madonna del Piano, 10, 50019 Sesto Fiorentino (Fi), Italy