Cheng, Chun-Chun. “Effects of Municipal Sludge and Wheat Straw Pyrolysis on Changes of Shapes of Heavy Metals”. Asian Journal of Chemistry 26, no. 1 (December 26, 2013): 21–24. Accessed July 4, 2024. https://asianpubs.org/index.php/ajchem/article/view/26_2_6.