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International Journal of Coal Geology,2005,61:
87 ~ 95 [15] Dai
S,Ren D,Hou X,Shao L. Geochemical and mineralogical anomalies of the late Permian coal in the Zhijin coalfield of southwest China and their volcanic origin. International Journal of Coal Geology,2003,55: 117 ~ 138 [16] ...