A M, Kadhum F, Attiya H. Effect of Ethephon, Boron and Zinc Spray on Anatomical Characters of Sunflower Crop (Helianthus annuus L.). Iraqi Journal of Science. 2024;54(4. Appendix):1078-1083. Accessed December 6, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12425