1. Department of Physical Geography, Ecology, and Nature Protection, Institute of Earth Sciences, Southern Federal University, Zorge Street 40, Rostov-on-Don 344090, Russia
2. Institute of Geology and Petroleum Technologies, Kazan Federal University, Kremlyovskaya Street 18, Kazan 420008, Russia
3. Department of Economics and Management, Business School, Cherepovets State University, Sovetskiy Avenue 10, Cherepovets 162600, Russia
4. Department of Organization and Technologies of Service Activities, ITSCI, Southern Federal University, 23-ja Linija Street 43, Rostov-on-Don 344019, Russia