Song, Bo, and Qing-Zhou Zhai. 2010. “Kinetic Spectrophotometic Determination of Trace Amounts of Copper Based on Its Catalytic Effect on the Reaction of DBC-Arsenazo and Hydrogen Peroxide”. Asian Journal of Chemistry 21 (7):5670-76. https://asianpubs.org/index.php/ajchem/article/view/18389.