Yang, Bo, Xuechang Dong, Yun Dai, Guangyu Yang, and Qiufen Hu. 2010. “Study on Colour Reaction of Chromium(III) With 2-(2-Quinolinylazo)-Resorcin Using Microwave Radiation and Its Application”. Asian Journal of Chemistry 20 (6):4545-52. https://asianpubs.org/index.php/ajchem/article/view/19061.