Sreenivasa Rao, Battula, et al. “Effect of Non-Ionic Surfactant (Triton X-100) on the Spectrophotometric Determination of Lead(II) With Potassium Benzyl Xanthate”. Asian Journal of Chemistry, vol. 22, no. 10, July 2010, pp. 7567-72, https://asianpubs.org/index.php/ajchem/article/view/12055.