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. Milica Ćirić, Faculty of Civil Engineering and Architecture in Niš, Serbia
5. Mladen Tomić, The School of Higher Technical Professional Education, Niš, Serbia
6. Emina Petrovic, Faculty of Mechanical Engineering in Niš, Serbia
7. Miloš Simonović, Faculty of Mechanical Engineering in Niš, Serbia

Final paper