Author(s):
1. Žana Stevanović, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia
2. Gradimir Ilić, Faculty of Mechanical Engineering in Niš, Serbia
3. Mića Vukić , Faculty of Mechanical Engineering in Niš, Serbia
4. Predrag Živković, Faculty of Mechanical Engineering in Niš, Serbia
5. Mladen Tomić, The School of Higher Technical Professional Education, Niš, Serbia
6. Ivan Lazović, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia