Author(s):
1. Dragan Živanić, Faculty of Technical Sciences, Department for Production Engineering, Serbia
2. Anto Gajić, Mine and Thermal Power Plant Ugljevik,
Republic of Srpska, Bosnia and Herzegovina
3. Jovan Vladić, Univerzitet u Novom Sadu, Tehnološki fakultet, Novi Sad, Serbia
4. Radomir Đokić, Fakultet tehničkih nauka Univerziteta u Novom Sadu, Serbia
5. Zdravko Ristić, Faculty of Technical Sciences, Department for Production Engineering, Serbia