1. Department of Mathematics, Statistics and Informatics, Tver State University, 170100 Tver, Russia
2. Department of Logistics and Transport Systems Management, Nosov Magnitogorsk State Technical University, 455000 Magnitogorsk, Russia
3. ME “Maggortrans”, 455000 Magnitogorsk, Russia
4. Department of Financial Technologies, Financial University under the Government of the Russian Federation, 105187 Moscow, Russia