A, A., D. A.B., and E. E.S. “AN EMPIRICAL MODEL FOR THE ESTIMATION OF GLOBAL AND DIFFUSE SOLAR RADIATION OVER YOLA, NORTH-EASTERN NIGERIA BASED ON AIR TEMPERATURE”. IJRDO-Journal of Applied Science, Vol. 3, no. 9, Sept. 2017, pp. 14-24, doi:10.53555/as.v3i9.1354.