H. SHUKER, N.; نزار; Q. MOHAMMAD, H.; حسام; H. AHMAD, S. On Singular and non Singular Rings. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 3, n. 1, p. 111–116, 2025. Disponível em: https://rjps.uomosul.edu.iq/index.php/csmj/article/view/20047. Acesso em: 5 aug. 2025.