I.S. Nikitin - Dr. Sc. (Phys.-Math.), Professor, Department of physics, MATI - Russian State Technological University (Moscow); Leading Research Scientist, Institute of Computer Aided Design of the RAS (Moscow). E-mail: i_nikitin@list.ru P.A. Yushkovskiy - Post-graduate Student, Department of physics, MATI - Russian State Technological University (Moscow). E-mail: abrahas.23@gmail.com