Nizhnevartovsk

UgryumovaMariaV.Nizhnevartovsk State University, 56 Lenina St., Nizhnevartovsk 628602, Russiamugruymova@mail.ru

BespalovaLudmilaN.Nizhnevartovsk State University, 56 Lenina St., Nizhnevartovsk 628602, Russiabiespalova_80@mail.ru

ChorefMikhailM.Nizhnevartovsk State University, 56 Lenina St., Nizhnevartovsk 628602, Russiachoref@yandex.ru