Sabri, A., and N. Abbood. “Preparation of Amino-Functionalized Mesoporous Silica (MCM-41) for Nitrate Anion Adsorption from Aqueous Solution”. Association of Arab Universities Journal of Engineering Sciences, Vol. 26, no. 2, June 2019, pp. 28-38, doi:10.33261/jaaru.2019.26.2.005.