Hassan, Mahmoud, Mohamed Amlas, Al Zein Al Zein, and Han Sheng. “Details Geological Mapping and Petrological Characteristics of EL Shereik Study Area, River Nile State, North Sudan”. Journal of Geography, Environment and Earth Science International 21, no. 1 (May 10, 2019): 1-23. Accessed October 17, 2019. http://journaljgeesi.com/index.php/JGEESI/article/view/30118.