V.V. Khryashchev1, N.V. Kotov2, A.A. Tikhomirov3, I.S. Nenakhov4

1–4 P.G. Demidov Yaroslavl State University (Yaroslavl, Russia)
1 v.khryashchev@uniyar.ac.ru, 2 nik-kotov-98@inbox.ru, 3 atikhomirov.00@gmail.com, 4 ilya.nenakhov@gmail.com