Antakli, Saad, Nazira Sarkis, and Ahmad Mahmod Al-Check. 2011. “Determination of Copper, Iron, Manganese, Nickel and Zinc in Tea Leaf Consumed in Syria by Flame Atomic Absorption Spectrometry After Microwave Digestion”. Asian Journal of Chemistry 23 (7):3268-72. https://asianpubs.org/index.php/ajchem/article/view/10570.