Xu, Guojing, Dongwei Li, Binquan Jiao, Shengli Guo, and Qiankun Peng. “Emission of Cu, Zn and Cd from Coal in Songzao Coal Mine During the Process of Combustion”. Asian Journal of Chemistry 26, no. 17 (August 12, 2014): 5887–5890. Accessed July 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/26_18_126.