1. Institute for High Performance Computing and Networking, National Research Council of Italy, Palermo, ICAR-CNR, Italy
2. Department of Information Engineering, Computer Science and Mathematics, University of L’Aquila, L’Aquila, Italy
3. Faculty of European Campus Rottal-Inn, Deggendorf Institute of Technology, Deggendorf, Germany
4. Faculty of Computer Science, Free University of Bozen-Bolzano, Bolzano, Italy