SƠN, L. C.; THI, V. 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/index.php/jcc/article/view/2865. Acesso em: 2 may. 2024.