TEAM, S. Bi-Bases of Γ-Semigroups: Pisit Kummoon, Thawhat Changphas. Thai Journal of Mathematics, [S. l.], p. 75–86, 2023. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/758. Acesso em: 7 apr. 2025.