1. V. A. Trapeznikov Institute of Control Sciences of Russian Academy of Sciences, Moscow, Russia
2. Faculty of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow, Russia
3. Institute for Information Transmission Problems of the Russian Academy of Sciences (Kharkevich Institute), Moscow, Russia
4. Southern Mathematical Institute of the Vladikavkaz Scientific Center of the Russian Academy of Sciences, Vladikavkaz, Russia