HÁN, Lê Quốc; DƯƠNG, Hồ Tiến. On Croisot - languages and Dubreil - languages having a group as syntactic monoid. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 20, n. 4, p. 343–350, 2012. DOI: 10.15625/1813-9663/20/4/1902. Disponível em: https://jcc.vast.vn/jcc/article/view/1902. Acesso em: 4 nov. 2025.