SUNDARAMOORTHI, P., and S. KALAINATHAN. “Growth and Characterization of Struvite Crystals in Silica Gel Medium and Its Nucleation Reduction Process”. Asian Journal of Chemistry, vol. 19, no. 4, Mar. 2010, pp. 2783-91, https://asianpubs.org/index.php/ajchem/article/view/13379.