IBRAHIM, G. “Evaluation of Antioxidant Activity, Quantitative Estimation of Phenols and Flavonoids of Oak Acorn From Erbil/Kurdistan”. Science Journal of University of Zakho, Vol. 1, no. 2, Sept. 2013, pp. 444-51, https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/185.