COVER 2, Vol. 57 No. 5. Cover 2. <b>Vietnam Journal of Science and Technology</b>, Hanoi, VN, v. 57, n. 5, 2019. DOI: 10.15625/2525-2518/57/5/14475. Disponível em: https://vjs.ac.vn/jst/article/view/14475. Acesso em: 11 jan. 2026.