1. Faculty of Civil Engineering and Architecture, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia
2. Faculty of Electronic Engineering, University of Niš, Aleksandra Medvedeva 12, 18000 Niš, Serbia
3. Faculty of Mechanical Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia