[1] Vologda State Univ, Vologda, Russia
[2] RAS, Fed Res Ctr Informat & Control, Inst Informat Problems, Vologda, Russia
[3] RAS, Vologda Res Ctr, Vologda, Russia
[4] Lomonosov Moscow State Univ, Fac Computat Math & Cybernet, Moscow, Russia
[5] Hangzhou Dianzi Univ, Hangzhou, Zhejiang, Peoples R China