Tajalli, Halawatun, Lisa Harsyiah, and Zulhan Widya Baskara. 2024. “Parameter Optimization Double Exponential Smoothing Using the Golden Section Method for Forecasting Closing Stock Price Pt. Telkom Indonesia (persero)”. Semeton Mathematics Journal 1 (1):15-23. https://doi.org/10.29303/semeton.v1i1.205.