VOL. 57 (1) (2019), Cover. COVER, Vol. 57, N. 1 (2019). <b>Vietnam Journal of Science and Technology</b>, Hanoi, VN, v. 57, n. 1, 2019. DOI: 10.15625/2525-2518/57/1/13622. Disponível em: https://vjs.ac.vn/jst/article/view/13622. Acesso em: 12 jan. 2026.