A. El Hag, A.M.M., A. A. Hassabo, I. Bushara Intesar, Y. Turki, and M. O. Eisa. “Determine Phosphorus and Calcium in Soil of the Grazing Area, El-Khuwei Locality, West Kordofan State, Sudan”. Scientific Journal of Veterinary Advances 3, no. 8 (August 29, 2014): 91-95. Accessed April 13, 2021. http://sjournals.com/index.php/sjva/article/view/1436.