A Class of ∗-Simple Type $A$ $ω^2$ -Semigroups (I). Communications in Mathematical Research, [S. l.], v. 29, n. 3, p. 218–230, 2021. Disponível em: https://global-sci.com/index.php/cmr/article/view/8772. Acesso em: 5 dec. 2025.