N.K. Zarubina - Lecturer, Southwest State University (Kursk). E-mail: nkzarubina@yandex.ru
O.V. Ovchinkin - Ph.D. (Eng.), Southwest State University (Kursk). E-mail: ovchinkin_o_v@mail.ru
A.I. Pykhtin - Ph.D. (Eng.), Southwest State University (Kursk). E-mail: sephiroth_kstu@mail.ru
