“Comparison of the Chen and Sinsgh’s Fuzzy Time Series Methods in Forecasting Farmer Exchange Rates in Indonesia”. UNP Journal of Statistics and Data Science 1, no. 4 (Agustus 28, 2023): 264–270. Diakses Oktober 2, 2026. https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/36.