1. Institute of Geology and Petroleum Technologies, Kazan Federal University, Kremlyovskaya Street 18, Kazan 420008, Republic of Tatarstan, Russia
2. Department of Commodity Science and Expertise, Plekhanov Russian University of Economics, Stremyanny Lane 36, Moscow 117997, Russia
3. Department of Organization and Technologies of Service Activities, Higher School of Business, Southern Federal University, 23-ja Linija Street 43, Rostov-on-Don 344019, Russia