1. University "Mediterranea" of Reggio Calabria, DICEAM, Via Graziella Feo di Vito, I-89100 Reggio Calabria, Italy
2. "Politehnica" University of Timisoara, Department of Electrical Engineering and Industrial Informatics, Πata Victoriei No. 2, 300006 Timisoara, jud. Timis, Romania