SCIENTIFIC RESEARCH ACTIVITIES IN HANOI UNIVERSITY. Journal of Foreign Language Studies, [S. l.], n. 09, p. 102, 2006. DOI: 10.56844/tckhnn.09.376. Disponível em: http://journals.hanu.edu.vn/index.php/tckhnn/article/view/376. Acesso em: 15 jan. 2026.