Nwokolo, Samuel, and Julie Ogbulezie. “Modeling the Influence of Cloudiness on Diffuse Horizon-Tal Irradiation under Various Sky Conditions in Nigeria”. International Journal of Physical Research 5, no. 2 (October 10, 2017): 91–100. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJPR/article/view/8312.