V.A. Smolar - Dr. Sc. (Phys.-Math.), Professor, Department «Physics», Volgograd State Technical University. E-mail: smolar.v@mail.ru
A.V. Eremin - Ph. D. (Phys.-Math.), Associate Professor, Department «Physics», Volgograd State Technical University. E-mail: eralex2007@yandex.ru
V.V. Eremin - Ph. D. (Phys.-Math.), Associate Professor, Department «Physics», Volgograd State Technical University. E-mail: vitaler80@rambler.ru
A.S. Burakov - Post-graduate Student, Department «Physics», Volgograd State Technical University. E-mail: burakov.a.c@gmail.com