1. Institute of Economic Sciences, Zmaj Jovina 12, Belgrade, Serbia
2. Technical Faculty in Bor, University of Belgrade, Vojske Jugoslavije 12, Bor, Serbia
3. National University of Science and Technology Politehnica Bucharest, Pitesti University Center, Str. Targu din Vale, no. 1, 110040, Pitesti, Romania; Institute of Doctoral and Post-Doctoral Studies, University Lucian Blaga of Sibiu, Bd. Victoriei no. 10, 550024, Sibiu, Romania; UNEC Research Methods Application Center, Azerbaijan State University of Economics (UNEC), Istiqlaliyyat Str. 6, Baku 1001, Azerbaijan
4. Faculty of Business and Administration, University of Bucharest, Bucuresti, Romania
5. Sports and Innovation Institute, Lithuanian Sports University, Sporto g. 6, 44221 Kaunas, Lithuania