THÁI, Nguyễn Xuân. Relation scheme that has a unique key. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 17, n. 4, p. 66–68, 2012. DOI: 10.15625/1813-9663/17/4/2293. Disponível em: https://jcc.vast.vn/jcc/article/view/2293. Acesso em: 4 nov. 2025.