HUY, Nguyễn Xuân; MINH, Lê Đức; LOÃN, Vũ Ngọc. Closed mappings and application in databases. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 16, n. 4, p. 1–6, 2013. DOI: 10.15625/1813-9663/16/4/2914. Disponível em: https://jcc.vast.vn/jcc/article/view/2914. Acesso em: 4 nov. 2025.