Barman, B., & Barua, S. (2010). Bis-[2,6-(2’-Hydroxy-4’-Sulpho-1’-Naphthylazo)]pyridine Disodium Salt as a Spectrophotometric Reagent for the Determination of Cadmium in Tobacco and Tobacco Products. Asian Journal of Chemistry, 23(2), 770–772. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/15834