Issa, Nureddin Ben, Ali Elmaghrabie, and Emhamed Boras. “Determination of Cr (III) and Cr (VI) In Water by Selective Separation and Preconcentration on Hybrid Resin”. Engineering And Technology Journal 7, no. 4 (April 11, 2022): 1213–1219. Accessed July 22, 2024. http://everant.org/index.php/etj/article/view/598.