Li, Yinke, Yun Huang, Yirang Xu, Peng Fan, Qiufen Hu, and Guangyu Yang. 2010. “Solid Phase Extraction and Flame Atomic Absorption Spectrometry for the Determination of Trace Cadmium”. Asian Journal of Chemistry 21 (7):5319-27. https://asianpubs.org/index.php/ajchem/article/view/18309.