Author(s):
1. Dušan Ješić, International technology Management Academy, Novi Sad, 2. Pavel Kovač, Faculty of Technical Sciences, Department for Production Engineering, Serbia
3. Dragan Rodić, Faculty of Technical Sciences, Department for Production Engineering, Serbia
4. Nikola Gvozdenović, Adeco doo, Serbia
5. Živko Aleksić, Srbijagas, Serbia