1. Faculty of Engineering, University of Kragujevac, Jovana Cvijića bb, 34000 Kragujevac, Serbia
2. Public Company “Parking Servis Kragujevac”, Vojislava Kalanovica bb, 34000 Kragujevac, Serbia
3. Faculty of Economics, University of Kragujevac, Djure Pucara Starog 3, 34000 Kragujevac, Serbia
4. American University in the Emirates, Academic City, Dubai, UAE