Gao, Hong-Wen, and Qing-Song Ye. 2010. “Investigation of Properties of Trace Zinc Complex Solution With 1-(6-Bromo-2-Benzothiazolylazo)-2 Naphthol”. Asian Journal of Chemistry 12 (3):806-10. https://asianpubs.org/index.php/ajchem/article/view/23064.