Al-Hadethi, M. E., S. UY, A.- H. SHJ, and A. O. Janabi. “Effect of Boron and Gibberellins Spray on the Chemical Content in the Leaves of Olive Tree”. Journal of Research in Biology, Vol. 9, no. 3, May 2019, pp. 2685-92, https://ojs.jresearchbiology.com/index.php/jrb/article/view/496.