Author(s):
1. Tomo Vujinović, Panevropski Univerzitet Aperion Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Milentije Stefanović, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
3. Srbislav Aleksandrovic, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia