Singh Kadyan, P. et al. 2012. Spectrophotometric Determination of Trace Cadmium in Tobacco with Tris-[2,4,6-(2-hydroxy-4-sulpho-1-naphthylazo)]-s-triazine, Trisodium Salt. Asian Journal of Chemistry. 24, 12 (Aug. 2012), 5876–5878.