1. University of Zilina,Faculty of Electrical Engineering and Information Technology,Department of Physics,Zilina,Slovakia
2. University of Zilina,Faculty of Electrical Engineering and Information Technology,Department of Mechatronics and Electronics,Zilina,Slovakia
3. Budapest University of Technology and Economics,Group of High Voltage Technology and Equipment, Egry J. utca 18,Budapest,Hungary,H-1111
4. University of West Bohemia, Univerzitní 26,Faculty, of Electrical Engineering,Department of Technologies and Measurement,Pilsen,Czech Republic,301 00
5. Lublin University of Technology, 38A, Nadbystrzycka Str,Faculty of Electrical Engineering and Computer Science,Department of Electrical Devices and High Voltage Technology,Lublin,Poland,20-618