Razaq Mohsin, Rewayda, and Enas Y. Abdalla. “Pairwise Separation Axioms And Compact Double Topological Spaces”. Journal of Al-Qadisiyah for Computer Science and Mathematics 3, no. 2 (September 29, 2017): 1–9. Accessed September 19, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/269.