1. Faculty of Electrical Engineering, Department of Electrotechnics and Measurements, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
2. PPRIME Institute, UPR 3346 CNRS - University of Poitiers - ISAE/ENSAM, University Institute of Technology, Angouleme, France
3. Faculty of Physics, Department of Physics, West University of Timisoara, Timisoara, Romania
4. Faculty of Electrical Engineering, Politehnica University of Bucharest, Bucharest, Romania