Ali A. Fahad, and Ayad A. H. Al-Maeiny. “Water Use Efficiency for Wheat under Water Stress Conditions of Central Iraq ”. Journal of Madenat Alelem University College, Vol. 2, no. 2, Dec. 2010, pp. 13-28, http://116.203.176.164/index.php/JMAUC/article/view/274.