D. O. . Akpootu, M. I. Iliyasu, A. M. . Rabiu, W. . Mustapha, C. F. . Okany, and S. I. . Salifu, “Developing Empirical Models for Estimating Photosynthetically Active Radiation over Akure, South Western, Nigeria”, IJASRE, vol. 5, no. 10, pp. 59–73, Oct. 2019.