Humadi, Nadia Kadum, and Haider Jebur Ali. “New Types of Perfectly Supra Continuous Functions”. Iraqi Journal of Science 61, no. 4 (April 26, 2020): 811–819. Accessed December 7, 2025. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/1409.