1. Department of Physics, Faculty of Electrical Engineering and Information Technology, University of Žilina, Žilina, Slovakia
2. Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Košice, Slovakia
3. Department of Technologies and Measurement, Faculty of Electrical Engineering, University of West Bohemia, Pilsen, Czech Republic
4. Department of Electric Power Engineering, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, Budapest, Hungary
5. Department of Electrical Devices and High Voltage Technology, Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland
6. VUKI a. s., Electroinsulating resins and varnishes, Bratislava, Slovakia