Naidu, U.V., K.V.S. Murthy, and G.R.K. Naidu. 2010. “Spectrophomeric Determination of Bismuth With Potassiuum Propyl Xanthante in Water ”. Asian Journal of Chemistry 3 (3):287-89. https://asianpubs.org/index.php/ajchem/article/view/25244.