Hadi, I. M. A., and Gh. A. Humod. “Strongly (Comletely) Hollow Submodules I”. Ibn AL-Haitham Journal For Pure and Applied Sciences 25, no. 3 (May 4, 2017): 393–403. Accessed March 31, 2025. https://jih.uobaghdad.edu.iq/index.php/j/article/view/557.