SIVASANKARI, C., et al. “Comparative Study of Powdered Activated Alumina With Granular Polymer-Agglomerated Alumina in Fluoride Removal from Drinking Water”. Asian Journal of Chemistry, vol. 22, no. 6, May 2010, pp. 4663-70, https://asianpubs.org/index.php/ajchem/article/view/16821.