van der Walt, Adriaan, and Charles Barker. “A Spatial-Analytical Investigation of the Rainfall and Temperature Patterns over Southern Africa”. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt; 36, no. 1 (July 19, 2017): 2 bladsye. Accessed April 20, 2024. http://www.satnt.ac.za/index.php/satnt/article/view/1469.