Kang, Yuan Chin, and Kamil Khalid. “Forecasting Natural Gas Prices in Malaysia Using Double Exponential Smoothing, Arima and XGBoost Models”. Enhanced Knowledge in Sciences and Technology, vol. 6, no. 1, Aug. 2026, pp. 566-71, https://periodical.uthm.edu.my/index.php/ekst/article/view/22182.