Yu.E. Korchagin – Dr.Sc.(Phys.-Math.), Associate Professor, Head of Department of Radiophysics,  Voronezh State University

E-mail: korchagin@phys.vsu.ru

K.D. Titov – Ph.D.(Phys.-Math.), Assistant, Department of Radiophysics, Voronezh State University E-mail: titovkd@gmail.com