THI, V. Đức. On the nonkeys. Journal of Computer Science and Cybernetics, [S. l.], v. 13, n. 1, p. 11–15, 2016. DOI: 10.15625/1813-9663/13/1/7979. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/7979. Acesso em: 2 may. 2024.