Buhani, et al. “Comparative Study of Adsorption Ability of Ni(II) and Zn(II) Ionic Imprinted Amino-Silica Hybrid Toward Target Metal in Solution”. Asian Journal of Chemistry, vol. 25, no. 5, Dec. 2012, pp. 2875-80, doi:10.14233/ajchem.2013.14166.