M. Nasser, Nasser, et al. “Chemical and Structural Properties of Titanium Dioxide Modified Jordanian Zeolitic Tuffs and Their Potential for the Removal of Phenolics in Aqueous Media”. Asian Journal of Chemistry, vol. 18, no. 3, July 2012, pp. 1919-34, https://asianpubs.org/index.php/ajchem/article/view/20897.