Adil, Elkrail, Kheir Omer, Shu Longcang, and Hao zenchun. 2003. “Hydrogeologic and Hydrochemical Investigation of Aquifers in Semi-Rid Area, Central Sudan”. Malaysian Journal of Science 22 (2):105-12. https://juku.um.edu.my/index.php/MJS/article/view/8524.