Author(s):
1. Ivan Miletic, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
2. Marko Miletic, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
3. Nenad Miloradović, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia