Ahmed, Muna Abbas, Iman Abdulhadi Dhari, and Zainab Abed Atiya. “Purely Small Submodules and Purely Hollow Modules”. Iraqi Journal of Science 63, no. 12 (December 30, 2022): 5487–5495. Accessed December 8, 2025. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6622.