Makhoul, G. M., M. Naddaf, A. Zidan, and R. Abu Alshamlat. “Influence of Foliar Application of Boron , Zinc and Humic Acid on Production of Olive Fruit (khodeiry variety), Quality of Fruit and Content of Oil”. Tishreen University Journal -Biological Sciences Series, vol. 42, no. 1, Mar. 2020, https://journal.tishreen.edu.sy/index.php/bioscnc/article/view/9491.