Irandi, Dinda Fitri, et al. “Forecasting Number of New Cases Daily COVID-19 in Central Java Province Using Exponential Smoothing Holt-Winters”. Indonesian Journal on Computing (Indo-JC), vol. 6, no. 2, Sept. 2021, pp. 23-32, doi:10.34818/INDOJC.2021.6.2.565.