Nwokolo, Samuel, Julie Ogbulezie, Kabele Togo, and Sylvia John-Jaja. “Estimations of Photosynthetically Active Radiation over Different Climatic Zones in Nigeria”. SPC Journal of Energy 1, no. 1 (April 4, 2018): 1–8. Accessed April 28, 2024. https://www.sciencepubco.com/index.php/E/article/view/9991.