Yulianto, T., Faisol, F., Zahroh, F., Suryanti, S., & Tafrikan, M.
(2021).
Forecasting the recovery of COVID-19 patients in East Java using the Fuzzy time series Cheng method.
Journal of Natural Sciences and Mathematics Research, 7(1), 44-50.
doi:
https://doi.org/10.21580/jnsmr.2021.7.1.11289