Oni, Joe Oladosu, and Bukola Olalekan Bolaji. “Development of a Universal DC Power Supply Using Solar Photovoltaic, Utility and Battery Power Sources”. Journal of Energy in Southern Africa 22, no. 1 (February 1, 2011): 12–17. Accessed July 3, 2024. https://journals.assaf.org.za/index.php/jesa/article/view/3199.