Li, Xuejin, Hao Wang, and Bo Liu. “Chemical Characteristics of Coal Gangue As Filter Material in Simulated Coal Mine Goaf”. Asian Journal of Chemistry 25, no. 16 (October 9, 2013): 9409–9410. Accessed June 26, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_17_129.