S. V. Zimina - Ph.D. (Eng.), Associate Professor, Nizhny Novgorod State University n.a. N.I. Lobachevsky. E-mail: zimina-sv@yandex.ru
S.V. Zimina - Ph. D. (Phys.-Math.), Associate Professor, National Research Lobachevsky State University of Nizhny Novgorod. E-mail: zimina-sv@yandex.ru