Грозный Erzhapova R.S.Chechen State University, 364093, Grozny, Sheripova str., 32mail@chesu.ru Read more about Erzhapova R. S. Alikhadzhiev М. Kh. Chechen State University, 364093, Grozny, Sheripova str., 32mail@chesu.ru, muhammadhafiz@mail.ru Read more about Alikhadzhiev M. Kh.