B.D. Zaitsev - Dr.Sc. (Phis.-Math.), Professor, Head of the laboratory, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences
A.A. Teplykh - Ph.D. (Phis.-Math.), Senior Researcher, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences. E-mail: teplykhaa@mail.ru
A.M. Shihabudinov - Ph.D. (Phis.-Math.), Researcher, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences. E-mail: alex-sheih@ya.ru