Shagari, M.S., and A. Azam. “Fixed Points of Hesitant Fuzzy Set-Valued Maps With Applications”. Carpathian Mathematical Publications 13, no. 3 (December 12, 2021): 711–726. Accessed November 21, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/4417.