1. Faculty of Mechanics and Technology, Rzeszow University of Technology, 37-450 Stalowa Wola, Poland
2. Faculty of Political Science and Journalism, University of Maria Curie-Skłodowska, 20-612 Lublin, Poland
3. Faculty of Law, Canon Law and Administration, The John Paul II Catholic University of Lublin, 20-950 Lublin, Poland
4. Department of Electrical Power Engineering, Electrical Engineering and Electromechanics, Ukrainian State University of Railway Transport, 61050 Kharkiv, Ukraine