M. Taginejad, “Rough Set in Fuzzy Approximation Space with Fuzzy Equivalence Class”, Fuzzy Optim. Model. J., vol. 1, no. 2, pp. 43–49, Oct. 2020, Accessed: Apr. 25, 2026. [Online]. Available: https://oiccpress.com/fomj/article/view/6434