Banerjee, S.P., and S. Pimplapure. “Preparation and Characterization of New Phosphatic Derivatives of Synthetic Zeolite-4A Provided by Indian Petrochemicals, Baroda”. Asian Journal of Chemistry, vol. 11, no. 1, Mar. 2010, pp. 234-6, https://asianpubs.org/index.php/ajchem/article/view/23249.