M.V. Davidovich – Dr.Sc.(Phys.-Math.), Professor, 

Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky E-mail: davidovichmv@info.sgu.ru

A.I. Timofeev – Head of Departament, 

LLC RPC «Etna Plus» (Saratov)

E-mail: info@etna.su

I.A. Kornev - Head of Research Group, 

LLC RPC «Etna Plus» (Saratov)

E-mail: iak.etna@yandex.ru