Affiliation: | (1) Institute for Problems of Information Transmission, Russian Academy of Sciences, Ermolovoi 19, 103051 Moscow, Russia;(2) Institute for Applied Problems of Mechanics and Mathematics, Ukrainian Academy of Sciences, Naukova 3b, 290601 Lviv, Ukraine;(3) Present address: E. Schrödinger International Institute for Mathematical Physics, Pasteurgasse 6/7, A-1090 Vienna, Austria |