MOHAMMED ALI, Muna Jasim. Some classes of pure sub-acts over semi-groups. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 42, p. 670–678, 2019. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7200. Acesso em: 27 oct. 2026.