Yusuf, Basiru, and Ani Shabri. “Enhancing Drought Forecasting Accuracy: A Wavelet-ARIMA Modelling Approach for Standardized Precipitation Index Data”. MATEMATIKA 41, no. 3 (November 15, 2025): 283–308. Accessed November 20, 2025. https://matematika.utm.my/index.php/matematika/article/view/1671.