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2. D2797 Standard practice for preparing coal samples for microscopical analysis by reflected light, Petroleum products, lubricants, and fossil fuels; Gaseous fuels; coal and coke;ASTM,2015
3. D7708 Standard test method for microscopical determination of the reflectance of vitrinite dispersed in sedimentary rocks, Petroleum products, lubricants, and fossil fuels; Gaseous fuels; coal and coke;ASTM,2015
4. Primary and secondary organic matter habitat in unconventional resources;L Canter;AAPG Memoir,2016