S. YOUNS AL-MASHHDANNY, A.; H. SHUKER, N. A Note on Non – Singular Rings. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 2, n. 2, p. 21–26, 2005. DOI: 10.33899/csmj.2005.164079 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36822. Acesso em: 17 dec. 2025.