Abi Rafdhi Hernandy, A. A. Rohmawati, and P. H. Gunawan. “An Exponential Smoothing Holt-Winters Based-Approach for Estimating Extreme Values of Covid-19 Cases”. Indonesia Journal on Computing (Indo-JC), Vol. 6, no. 2, Sept. 2021, pp. 43-52, doi:10.34818/INDOJC.2021.6.2.576.