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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