A.N. Astafyev1, S.I. Gerashchenko2, Z.M. Yuldashev3, A.N. Mitroshin4, A.A. Makhov5, N.N. Yankina6
1 Lipetsk State Technical University (Lipetsk, Russia)
2, 4–6 Penza State University (Penza, Russia)
3 St. Petersburg State Electrotechnical University (LETI) (St. Petersburg, Russia)
1 a.n.astafyev@gmail.com, 2 mpo@mail.ru, 3 yuld@mail.ru, 4 an-mitroshin@mail.ru, 5 2257005@bk.ru, 6prisend@yandex.ru