D. MAHMOOD, R.; M. ABDUL-JABBAR, A. On Rings Whose Simple Singular R-Modules Are Flat, I. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 7, n. 1, p. 51–57, 2010. DOI: 10.33899/csmj.2010.163846 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36609. Acesso em: 17 dec. 2025.