1. Institute of Applied Mathematical Research, Karelian Research Centre, Russian Academy of Sciences, 185035 Petrozavodsk, Russia
2. Department of Applied Mathematics and Informatics, Yaroslav-the-Wise Novgorod State University, 173020 Veliky Novgorod, Russia
3. Department of Applied Mathematics and Cybernetics, Petrozavodsk State University, 185910 Petrozavodsk, Russia
4. Department of Applied Mathematics and Computer Modelling, National University of Oil and Gas (Gubkin University), 119991 Moscow, Russia
5. Department of Applied Probability and Informatics, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia