محمد الأمين الشريف و محمد إبراهيم علوه 2018. Comparison of the values calculated in the mathematical models used to estimate the amount of solar radiation falling on a horizontal surface with the measured values of the city of Sabha. Journal of Pure & Applied Sciences . 17, 1 (Jul. 2018). DOI:https://doi.org/10.51984/jopas.v17i1.469.