R. bakri, S. Inayati, Y. Yuliana, and A. Hanafiah, “PREDIKSI JUMLAH PESERTA BPJS PENERIMA BANTUAN IURAN (PBI) APBN MENGGUNAKAN METODE FUZZY TIME SERIES CHENG”, BAREKENG: J. Math. & App., vol. 15, no. 2, pp. 373-384, Jun. 2021.