A.A. Zabolotnykh, V.A. Volkov

E.S. Pavlov - Scientific Researcher, Kotelnikov SBIRE RAS E-mail: gekapavlov@gmail.com A.V. Sadovnikov - Ph.D. (Phys.-Math.), Scientific Researcher, Saratov State University named after N.G. Chernyshevskii Yu.A. Filimonov - Dr.Sc. (Phys.-Math.), Director of Kotelnikov SBIRE RAS