P. O. Afanasyev - Assistant, Southern Federal University M. B. Manuilov - Dr.Sc. (Phys.-Math.), Professor, Southern Federal Uni-versity E-mail: m_manuilov@sfedu.ru S. M. Matytsin - Ph.D. (Phys.-Math.), Head of Matsing Pte Ltd. V. A. Sledkov - Ph.D. (Phys.-Math.), Leading Research Scientist, Southern Federal University