Li, Mei, et al. “Study on Cadmium Complex Reaction With P-Acetyl Benzenediazo- Aminoazobenze and Determination of Trace Amounts of Cadmium by Β-Correction Spectrophotometry ”. Asian Journal of Chemistry, vol. 14, no. 2, Mar. 2010, pp. 811-20, https://asianpubs.org/index.php/ajchem/article/view/22157.