Institute of Systems Analysis and Computer Science - National Research Council, 00185, Rome, Italy.|Institute of Systems Analysis and Computer Science - National Research Council, 00185, Rome, Italy, Department of Computer, Control, and Management Engineering - Sapienza University, 00185, Rome, Italy and.|Institute of Systems Analysis and Computer Science - National Research Council, 00185, Rome, Italy.|Institute of Systems Analysis and Computer Science - National Research Council, 00185, Rome, Italy.|Institute of Systems Analysis and Computer Science - National Research Council, 00185, Rome, Italy, Department of Engineering - Uninettuno International University, Corso Vittorio Emanuele II, 39 - 00186 Rome, Italy.