R.K. Yafarov – Dr. Sc. (Eng.), Professor, Saratov branch of Kotel'nikov IRE of RAS

E-mail: pirpc@yandex.ru

S.Yu. Suzdaltsev – Ph. D. (Eng.), Saratov branch of Kotel'nikov IRE of RAS

E-mail: suzdaltsevsy@rambler.ru

V.Ya. Shanygin – Saratov branch of Kotel'nikov IRE of RAS

E-mail: vitairerun@mail.ru