Author(s):
1. Miloš Simonović, Faculty of Mechanical Engineering in Niš, Serbia
2. Emina Petrovic, Faculty of Mechanical Engineering in Niš, Serbia
3. Vlastimir Nikolic, Faculty of Mechanical Engineering in Niš, Serbia
4. Ivan Ćirić, Faculty of Mechanical Engineering in Niš, Serbia
5. Aleksandar Miltenović, Faculty of Mechanical Engineering in Niš, Serbia