1. Department of Applied Mathematics and Computer Modeling, National University of Oil and Gas “Gubkin University”, 65, Leninsky Prospekt, 119991 Moscow, Russia
2. Department of Applied Probability and Informatics, Peoples’ Friendship University of Russia (RUDN University), Miklukho-Maklaya Str., 6, 117197 Moscow, Russia
3. Department of Natural Sciences, Moscow University of the Ministry of Internal Affairs of the Russian Federation Named after V. J. Kikot, Russia, St. Academician Volgin, 12, 117437 Moscow, Russia