Ghorbani, Azam, Setareh Najarian, and Zinab Khosropour. 2011. “Determination of Some Trace Elements in Natural Waters by Atomic Absorption Spectroscopy After Preconcentration by XAD-4 GBHA System”. Asian Journal of Chemistry 23 (9):4202-4. https://asianpubs.org/index.php/ajchem/article/view/10819.