T.A. Karetnikova - Post-graduate student, Saratov State University named after N.G. Chernyshevskii. E-mail: KaretnikovaT@mail.ru
A.G. Rozhnev - Senior researcher, Saratov State University. E-mail: RozhnevAG@info.sgu.ru
N.M. Ryskin - Dr.Sc. (Phys.-Math.), professor, Saratov State University named after N.G. Chernyshevskii. E-mail: RyskinNM@info.sgu.ru
G.V. Torgashov - Ph.D. (Phys.-Math.), Head of Laboratory, Saratov Branch, V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS. E-mail: TorgashovGV@gmail.com
I.G. Torgashov - Ph.D. (Phys.-Math.), Senior researcher, Saratov Branch of V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS. E-mail: TorgashovIG@gmail.com
N.I. Sinitsyn - Dr.Sc. (Phys.-Math.), Vice-director, Saratov Branch of V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS. E-mail - SinitsynNI@gmail.com