MANH, L. Hệ GT89. Journal of Computer Science and Cybernetics, [S. l.], v. 6, n. 1, p. 27–30, 2018. DOI: 10.15625/1813-9663/6/1/11136. Disponível em: https://vjs.ac.vn/index.php/jcc/article/view/11136. Acesso em: 28 apr. 2024.