Ahmed Yousif Hachum, D. and Eman Hazim Sheet, D. 2010. Estimating Yield Response Factors for Maize Crop in Jensen Model. Al-Rafidain Engineering Journal (AREJ). 18, 3 (Jun. 2010), 85–89. DOI:https://doi.org/10.33899/rengj.2010.28452.