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D.S. Kumankin1, S.A. Yamashkin2
1,2 National Research Mordovia State University (Saransk, Russia)
D.S. Kumankin1, S.A. Yamashkin2, S.A. Fedosin3
1–3 National Research Mordovian State University n.a. N.P. Ogarev (Saransk, Russia) 1 d.kumankin@gmail.com; 2 yamashkinsa@mail.ru; 3 fedosinsa@mrsu.ru