Malaudzi, S. T.; Sankaran, V.; Lysko, M. D. Solar Radiation Analysis and Regression Coefficients for the Vhembe Region, Limpopo Province, South Africa. J. energy South. Afr. 2013, 24 (3), 2-7. https://doi.org/10.17159/2413-3051/2013/v24i3a3136.