Aqeel, Radhwan Mohammed, and Anhar Ahmed Nasser. “On Fuzzy Pre-Λ-Sets and Fuzzy Semi-Λ- Sets”. Electronic Journal of University of Aden for Basic and Applied Sciences 4, no. 1 (March 31, 2023): 139–146. Accessed May 2, 2024. https://www.ejua.net/index.php/EJUA-BA/article/view/229.