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International Journal of Coal Geology > 2004 > 57 > 3-4 > 243-263
International Journal of Coal Geology > 2003 > 54 > 1-2 > 57-68
International Journal of Coal Geology > 2004 > 57 > 3-4 > 243-263
International Journal of Coal Geology > 2003 > 54 > 1-2 > 57-68