Nababan, Y. P., and R. Pane. “Forecasting the Amount of Oil Palm Production in Simalungun Regency Based on Data for 2000-2019 Using Double Exponential Smoothing Method”. Journal of Mathematics Technology and Education, vol. 1, no. 2, Mar. 2022, pp. 183-95, doi:10.32734/jomte.v1i2.7734.