International Journal of Coal Geology
International Journal of Coal Geology > 2006 > 66 > 3 > 157-178
International Journal of Coal Geology > 2006 > 68 > 1-2 > 117-126
International Journal of Coal Geology > 2006 > 66 > 3 > 157-178
International Journal of Coal Geology > 2006 > 68 > 1-2 > 117-126