1. Research-Development Institute for Environmental Protection Technologies and Equipment, S.C. ICPE Bistriţa S.A., Parcului Str., No. 7, 420035 Bistrita, Romania
2. National Institute for Research and Development in Electrical Engineering ICPE-CA Bucharest, 313 Splaiul Unirii, 030138 Bucharest, Romania
3. Faculty of Electrical Engineering, Technical University of Cluj Napoca, G. Bariţiu Str., No. 26-28, 400027 Cluj-Napoca, Romania