YADAV, INDERJEET, and SHIPRA BHARDWAJ. “Use of Solar Energy in Removal of Quinaldine Red from Effluents Using PbS As Semiconductor”. Asian Journal of Chemistry, vol. 19, no. 7, Mar. 2010, pp. 5177-80, https://asianpubs.org/index.php/ajchem/article/view/13121.