1. Geographical Institute “Jovan Cvijić”, Serbian Academy of Sciences and Arts, 11000 Belgrade, Serbia
2. Institute of Environmental Engineering, Peoples’ Friendship University of Russia (RUDN University), Moscow 117198, Russia
3. Faculty of Hotel Management and Tourism, University of Kragujevac, 36210 Vrnjačka Banja, Serbia
4. Department of Regional Economics and Geography, Faculty of Economics, Peoples’ Friendship University of Russia (RUDN University), Moscow 117198, Russia
5. Department of Leskovac Vocational College, Academy of Vocational Studies Southern Serbia, 16000 Leskovac, Serbia