M. IBRAHEEM, Z. On Rings whose Simple Singular R-Modules are GP-Injective. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 2, n. 1, p. 63–67, 2005. DOI: 10.33899/csmj.2005.164068 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36342. Acesso em: 18 dec. 2025.