BAN, Đoàn Văn; THẠNH, Lê Mạnh; HÙNG, Hoàng Bảo. The equivalent expression between the OODB query language OQL and the object algebra. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 20, n. 3, p. 257–269, 2012. DOI: 10.15625/1813-9663/20/3/1488. Disponível em: https://vjs.ac.vn/jcc/article/view/1488. Acesso em: 23 dec. 2025.