Abou Rida, M., and F. Harb. “Synthesis and Characterization of Amorphous Silica Nanoparitcles from Aqueous Silicates Uisng Cationic Surfactants”. Journal of Metals, Materials and Minerals, vol. 24, no. 1, June 2014, http://jmmm.material.chula.ac.th/index.php/jmmm/article/view/108.