D. MAHMOOD, R.; TH. YOUNS, M. On n - Regular Rings. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 8, n. 2, p. 53–59, 2011. DOI: 10.33899/csmj.2011.163628. Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36642. Acesso em: 18 dec. 2025.