KHOA, Nguyễn Đăng. Rough relational database and query optimization techniques. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 19, n. 4, p. 353–358, 2012. DOI: 10.15625/1813-9663/19/4/1543. Disponível em: https://jcc.vast.vn/jcc/article/view/1543. Acesso em: 4 nov. 2025.