-Mahmod, A. A., A. J. H . Al-Saidi, and K. A. Saltern. 2017. “Effect of Interaction Betw·een Phosphorus and Zink in Some Morphological Features of Two Varieties of Wheat Grown in Gypsum Soil”. Ibn AL-Haitham Journal For Pure and Applied Sciences 21 (3): 37-55. https://jih.uobaghdad.edu.iq/index.php/j/article/view/1403.