Sivhugwana, K.S., and E. Ranganai. “Intelligent Techniques, Harmonically Coupled and SARIMA Models in Forecasting Solar Radiation Data: A Hybridization Approach”. Journal of Energy in Southern Africa 31, no. 3 (October 20, 2020): 14–37. Accessed April 24, 2024. https://energyjournal.africa/article/view/7754.