Sudha Periathai1, R., et al. “Influence of PH on the Properties of SnO2 Nanoparticles Synthesized by Sol-Gel Process”. Asian Journal of Chemistry, vol. 25, no. 20, May 2013, pp. 185-7, https://asianpubs.org/index.php/ajchem/article/view/25_Supplementary%20Issue_50.