Ahmed, Ghaleb, and Zainab Saadi. “Weakly Secondary Submodules”. Journal of Al-Qadisiyah for Computer Science and Mathematics 11, no. 3 (September 6, 2019): Math Page 50–59. Accessed November 14, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/594.