Bijan Davvaz, Imam Mukhlash, and Soleha2. “Himpunan Fuzzy Dan Rough Sets”. Limits: Journal of Mathematics and Its Applications 18, no. 1 (May 15, 2021): 79–94. Accessed February 7, 2026. https://journal.its.ac.id/index.php/limits/article/view/5388.