Author(s):
1. Danijela Nikolic, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
2. Jasmina Skerlić, Faculty of Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Srbija 2IMW Ins, Serbia
3. Vanja Šušteršič, Serbia
4. Jasna Radulovic, Fakultet inženjerskih nauka Univerziteta u Kragujevcu, Serbia
5. Aleksandar Mišković, Visoka tehnička škola strukovnih studija u Kragujevcu; , Serbia

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