Damayanti S, Yosmar S, Afandi N. IMPLEMENTATION OF FUZZY TIME SERIES CHEN FOR FORECASTING INDONESIAN OIL AND GAS IMPORTS VALUE. BAREKENG: J. Math. & App. [Internet]. 11Jun.2023 [cited 3Jul.2024];17(2):0685-94. Available from: https://ojs3.unpatti.ac.id/index.php/barekeng/article/view/7445