Gao, Hong-Wen, and Qing-Song Ye. “Investigation of Properties of Trace Zinc Complex Solution With 1-(6-Bromo-2-Benzothiazolylazo)-2 Naphthol”. Asian Journal of Chemistry, vol. 12, no. 3, June 2010, pp. 806-10, https://asianpubs.org/index.php/ajchem/article/view/23064.