H. Shuker, N., نزار, H. Q. Mohammad, حسام, and S. H. Ahmad. “On Singular and Non Singular Rings”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 3, no. 1, June 2025, pp. 111-6, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/20047.