1. University of Niš, Faculty of Electronic Engineering, Niš, Serbia + Institute of Technical Sciences of SASA, Belgrade, Serbia
2. University of Belgrade, Faculty of Mechanical Engineering, Belgrade
3. University of Niš, Faculty of Science and Mathematics, Niš
4. University of Niš, Faculty of Electronic Engineering, Niš, Serbia
5. University of Niš, Faculty of Mechanical Engineering, Niš