Author(s):
1. Predrag Živković, Faculty of Mechanical Engineering in Niš, Serbia
2. Mladen Tomić, The School of Higher Technical Professional Education, Niš, Serbia
3. Dušan Petković, Faculty of Mechanical Engineering in Niš, Serbia
4. Ivan Ciric, Faculty of Mechanical Engineering in Niš, Serbia
5. Mirko Dobranjac, University of Banja Luka, Faculty of mechanical engineering,
Republic of Srpska, Bosnia and Herzegovina
6. Velimir Stefanovic, Faculty of Mechanical Engineering in Niš, Serbia
7. Zana Stevanović, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia