Devianto, Dodi, Aulia Zuardin, and Maiyastri Maiyastri. “TIME SERIES MODELING OF NATURAL GAS FUTURE PRICE WITH FUZZY TIME SERIES CHEN, LEE AND TSAUR”. BAREKENG: Jurnal Ilmu Matematika dan Terapan 16, no. 4 (December 15, 2022): 1185-1196. Accessed May 4, 2024. https://ojs3.unpatti.ac.id/index.php/barekeng/article/view/5888.