Zeyada, Nasr A., and Amr K. Amin. “Aspects of Weak, $s$-Cs and Almost Injective Rings”. Sarajevo Journal of Mathematics 12, no. 2 (May 30, 2024): 183–192. Accessed January 26, 2026. https://www.sjm.anubih.ba/index.php/sjm/article/view/187.