Al-Mothafar, Nuhad, and Sahira Yassin. “On δ-Small Projective Modules”. Iraqi Journal of Science 54, no. 3. Mathematics conf (February 13, 2024): 855–860. Accessed December 7, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12503.