KS E ISO 7404-5-2013(2023) Methods for the petrographic analysis of bituminous coaland anthracite-Part 5: Method of determining microscopicallythe reflectance of vitrinite
2013KS E ISO 7404-5:2013 Methods for the petrographic analysis of bituminous coaland anthracite-Part 5: Method of determining microscopicallythe reflectance of vitrinite
2003KS E ISO 7404-5:2003 Methods for the petrographic analysis of bituminous coal and anthracite-Part 5 : Method of determining microscopically the reflectance of vitrinite