Ibrahim, Omar Hameed, and Nuhad Salim Al-Mothafar. “Pure Closed Submodules and Pure Extending Modules”. Iraqi Journal of Science 66, no. 7 (July 30, 2025): 2909–2916. Accessed December 7, 2025. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12771.