International Journal of Coal Geology
International Journal of Coal Geology > 2009 > 77 > 1-2 > 234-241
International Journal of Coal Geology > 2009 > 77 > 1-2 > 23-33
International Journal of Coal Geology > 2009 > 77 > 1-2 > 137-144
International Journal of Coal Geology > 2009 > 77 > 1-2 > 127-136
International Journal of Coal Geology > 2009 > 77 > 1-2 > 109-118