Talib, Sally A., and Fatema F. Kareem. “Interval Value Fuzzy K-Ideals of a KU-Semigroup”. Ibn AL-Haitham Journal For Pure and Applied Sciences 33, no. 2 (April 20, 2020): 95–106. Accessed July 27, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/2430.