L.I. Averina - Ph.D. (Phys.-Math.), Associate Professor, Department of Electronics, Voronezh State University. E-mail: averina@phys.vsu.ru
A.M. Bobreshov - Dr.Sc. (Phys.-Math.), Professor, Head of Electronics Department, Voronezh State University. E-mail: bobreshov@phys.vsu.ru
V.D. Shutov - undergraduate student, Department of Electronics, Voronezh State University. E-mail: vovchik888@gmail.com