Melgat, Basim Mohammed, and Munir Abdul Khalik AL-Khafaji. “Fuzzy Neighborhood Systems in Fuzzy Topological Ring”. Journal of Al-Qadisiyah for Computer Science and Mathematics 11, no. 4 (January 12, 2020): Math Page 87– 93. Accessed November 13, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/651.