Author(s):
1. Dejan Kojić, Univerzitet za poslovni inženjering i menadžment, Tehnički fakultet, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Gordana Markovic, Tigar A.D., Pirot, Serbia
3. Milena Marinovic-Cincovic, University of Belgrade, Vinča Institute of Nuclear Sciences, Serbia, Serbia
4. Vojislav Jovanović, PMF Kosovska Mitrovica, Serbia
5. Suzana Samaržija-Jovanovic, PMF Kosovska Mitrovica, Serbia
6. Nevena Vukic, University of Novi Sad, Faculty of Technology, Serbia, Serbia
7. Jaroslava Budinski-Simendic, Univerzitet u Novom Sadu, Tehnološki fakultet, Novi Sad, Serbia

Final paper