Do Thi Quyen1, Le Hung Ninh2, O. B. Anikin3, E. N. Smirnov4

1–4 State University of Management (Moscow, Russia)
1 doquyen.ictu@gmail.com, 2 lehungninh.ch20bkdtm@gmail.com, 3 Ob_anikin@guu.ru, 4 smirnov_en@mail.ru