Gayen, Sudipta, Sripati Jha, Manoranjan Kumar Singh, and Ashish Kumar Prasad. “On Anti-Fuzzy Subgroup”. Yugoslav Journal of Operations Research 31, no. 4 (November 1, 2021): 539–546. Accessed July 28, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/682.