1. D2797 Standard Practice for Preparing Coal Samples for Microscopical Analysis by Reflected Light, Petroleum Products, Lubricants, and Fossil Fuels; Gaseous Fuels; Coal and coke, sec. 5, v. 05.06;ASTM,2015
2. 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, sec. 5, v. 05.06;ASTM,2015
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