SƠN, Lương Cao; THI, Vũ Đức. Some observations on the second normal form. Journal of Computer Science and Cybernetics, [S. l.], v. 16, n. 2, p. 1–4, 2013. DOI: 10.15625/1813-9663/16/2/2865. Disponível em: https://vjs.ac.vn/jcc/article/view/2865. Acesso em: 30 apr. 2025.