Pirzada, U. M., and D. C. Vakaskar. “Existence of Hukuhara Differentiability of Fuzzy-Valued Functions”. The Journal of the Indian Mathematical Society 84, no. 3-4 (July 1, 2017): 239–254. Accessed May 8, 2024. https://www.informaticsjournals.com/index.php/jims/article/view/5824.