Author(s):
1. Dragana Dimitrijević, Faculty of Mechanical Engineerning, Serbia
2. Predrag Živković, Faculty of Mechanical Engineering in Niš, Serbia
3. Janja Branković, Faculty of Mechanical Engineering in Niš, Serbia
4. Mirko Dobrnjac, Faculty of Mechanical Engineering,
Republic of Srpska, Bosnia and Herzegovina
5. Žana Stevanović, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia