Rasuli, Rasul. “Fuzzy Equivalence Relation, Fuzzy Congrunce Relation and Fuzzy Normal Subgroups on Group G Over T-Norms”. Asian Journal of Fuzzy and Applied Mathematics 7, no. 2 (April 20, 2019). Accessed April 25, 2024. https://ajouronline.com/index.php/AJFAM/article/view/5736.