M. Ibraheem, Zubayda. “On Rings Whose Simple Singular R-Modules Are GP-Injective”. AL-Rafidain Journal of Computer Sciences and Mathematics 2, no. 1 (June 5, 2005): 63–67. Accessed December 18, 2025. https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36342.