Al-Youzbakey, K., and S. Al-Dabbagh. “Geochemistry of Phosphorite and Associated Rocks of Akashat Formation (Middle Paleocene) in Akashat Mine, Iraqi Western Desert. Part II: Trace Elements”. Iraqi National Journal of Earth Science (INJES), vol. 19, no. 2, Dec. 2019, pp. 100-18, doi:10.33899/earth.2019.170282.