1. Industrijska Oprema d.o.o., 11000 Belgrade, Serbia
2. Faculty of Mechanical Engineering, University of Belgrade, 11000 Belgrade, Serbia
3. Faculty of Transport and Traffic Engineering, University of Belgrade, 11000 Belgrade, Serbia
4. Department in Kragujevac, Academy of Professional Studies Sumadija, 34000 Kragujevac, Serbia
5. Faculty of Manufacturing Technologies with a Seat in Presov, Technical University of Kosice, 08001 Presov, Slovakia