HÁN, Lê Quốc; BÍCH, Nguyễn Thị. On Isolate - Languages having a groups as syntatic monoid. Journal of Computer Science and Cybernetics, [S. l.], v. 19, n. 2, p. 101–109, 2012. DOI: 10.15625/1813-9663/19/2/1501. Disponível em: https://vjs.ac.vn/jcc/article/view/1501. Acesso em: 30 apr. 2025.