R. U. NDUBUISI; U. I. ASIBONG-IBE; I. U. UDOAKPAN. A Class of *-Simple Type A I-Semigroups. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 1 - E, p. 1227–1234, 2018. Disponível em: https://ijmaa.in/index.php/ijmaa/article/view/1226. Acesso em: 3 jul. 2024.