1. International Laboratory for Finance and Financial Markets, Faculty of Economics, People’s Friendship University of Russia (RUDN University), 117198 Moscow, Russia
2. Geographical Institute “Jovan Cvijić”, Serbian Academy of Sciences and Arts, 11000 Belgrade, Serbia
3. Independent Researcher, Kolkata 711112, India
4. Institute of Sports, Tourism and Service, South Ural State University, 454080 Chelyabinsk, Russia