1. Department of Economics, Vincent Pol University in Lublin, 2, Choiny Str., 20-816 Lublin, Poland
2. Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38d, Nadbystrzycka Str., 20-618 Lublin, Poland
3. Department of High Voltage and Power Engineering, West Pomeranian University of Technology, 37, Sikorskiego Str., 70-313 Szczecin, Poland
4. Nynas AB Raffinaderivagen, 21, 149 82 Nynashamn, Sweden
5. Energo-Complex Sp. z o.o., 9, Lotników Str., 41-949 Piekary Slaskie, Poland