R.I. Zudov1, V.A. Sorotsky2, A.O. Pergushev3, N.V. Kulikov4

1-4 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

1 rzudov@spbstu.ru; 2 sorotsky@spbstu.ru; 3 pergushev.aleksey@mail.ru; 4 allismatrix@gmail.com