International Journal of Coal Geology
International Journal of Coal Geology > 2008 > 76 > 1-2 > 46-51
International Journal of Coal Geology > 2013 > 115 > C > 79-84
International Journal of Coal Geology > 2008 > 76 > 1-2 > 46-51
International Journal of Coal Geology > 2013 > 115 > C > 79-84