Author(s):
1. Ivan Ćirić, Faculty of Mechanical Engineering in Niš, Serbia
2. Žarko Ćojbašić, Faculty of Mechanical Engineering in Niš, Serbia
3. Vlastimir Nikolic, Faculty of Mechanical Engineering in Niš, Serbia
4. Predrag Živković, Faculty of Mechanical Engineering in Niš, Serbia
5. Dušan Petković, Faculty of Mechanical Engineering in Niš, Serbia
6. Mladen Tomić, The School of Higher Technical Professional Education, Niš, Serbia
7. Misa Tomić, Faculty of Mechanical Engineering in Niš, Serbia