Nizhny Novgorod ErmilovaAnnaV. Nizhny Novgorod State University. N.I. Lobachevsky, 603950, Nizhny Novgorod, Gagarin Ave., 23ermilova.75@bk.ru Read more about Ermilova Anna V. PrivalovIgorVasilevich Nizhny Novgorod State University. N.I. Lobachevsky, 603950, Nizhny Novgorod, Gagarin Ave., 23Privalov.i@mail.ru Read more about Privalov Igor Vasilevich IudinAkeksandrAnatolevich Nizhny Novgorod State University. N.I. Lobachevsky, 603950, Nizhny Novgorod, Gagarin Ave., 23iudin@fsn.unn.ru Read more about Iudin Akeksandr Anatolevich SudinS.A. Nizhny Novgorod State University. N.I. Lobachevsky, 603950, Nizhny Novgorod, Gagarin Ave., 23sudjin@mail.ru Read more about Судьин С. А.