1. Institute of Socio-Economic Development of Territories Russian Academy of Sciences, Gorkogo Str., 56A, Vologda, Russia / Department of Applied Mathematics Vologda State University, Vologda, S. Orlova, 6, Russia
2. Department of Applied Mathematics Vologda State University, Vologda, S. Orlova, 6, Russia
3. Institute of Problems of Informatics Russian Academy of Sciences, Vavilova str., 44-2, Moscow, Russia
4. Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University, Leninskie Gory, Moscow, Russia