“Fast, Efficient and Environmentally Friendly Extraction of Cu(II) and Zn(II) by Hybrid Silicas Impregnated With Acidic Organic Extractants”. JOURNAL OF ADVANCES IN CHEMISTRY, vol. 12, no. 4, Dec. 2016, pp. 4374-86, https://doi.org/10.24297/jac.v12i4.2177.