A.A. Galiev − Post-graduate Student,
Department of Radiophysics, Kazan Federal University, Institute of Physics
E-mail: ggalievv@mail.ru
A.I. Sulimov − Ph.D. (Phys.-Math.), Associate Professor,
Department of Radiophysics, Kazan Federal University, Institute of Physics
E-mail: asulimo@gmail.com
A.V. Karpov − Dr.Sc. (Phys.-Math.), Professor,
Department of Radiophysics, Kazan Federal University, Institute of Physics
E-mail: arkadi.karpov@kpfu.ru