1. Standard practice for conducting an interlaboratory test program to determine the precision of test methods. 1987;American Society for Testing and materials (ASTM),1987
2. Standard test method for microscopical determination of the reflectance of the organic components in a polished specimen of coal. 1990;American Society for Testing and Materials (ASTM),1990
3. Reflectance of coal;Broadbent;Fuel,1955
4. A chemical kinetic model of vitrinite maturation and reflectance;Burnham;Geochim. Cosmochim. Acta,1989
5. A discussion of some of the methods of physical characterization used for coal;Davis,1978