M. G. ASHOK KUMAR; E. KRISHNAN. Affine Semigroups in an Algebra. International Journal of Mathematics And its Applications, [S. l.], v. 5, n. 4 - B, p. 259–263, 2017. Disponível em: https://ijmaa.in/index.php/ijmaa/article/view/1264. Acesso em: 3 jul. 2024.