1. Semeion Research Center of Sciences of Communication, Via Sersale 117, 00128 Rome, Italy
2. Department of Mathematical and Statistical Sciences, University of Colorado, 1201 Larimer St., Denver, CO 80204, USA
3. Comando per le Operazioni in Rete (COR), Italian Defense General Staff, Via Stresa, 31/b, 00135 Rome, Italy
4. C4I and MSA Division and Development New System, Italian Navy, Via Stresa, 31/b, 00135 Rome, Italy