CHÍNH, Tăng Thị; CƯỜNG, Bùi Văn. {"en_US":"Untitled"}. <b>Vietnam Journal of Science and Technology</b>, Hanoi, VN, v. 49, n. 2, 2012. DOI: 10.15625/0866-708X/49/2/1844. Disponível em: https://vjst.vast.vn/jst/article/view/1844. Acesso em: 17 apr. 2026.