“The Morphological Change in Sunflower Plant under Hardening Conditions to Drought Tolerance. II. Leaf Number and Leaf Area”. Baghdad Science Journal 6, no. 3 (September 6, 2009): 470–479. Accessed June 18, 2025. https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/1005.