1. ASTM D2798-11a, 2011. Standard Test Method for Microscopical Determination of Vitrinite Reflectance of Coal. ASTM International, 2006: 2798-06.
2. ASTM D3173/D3173M-17a, 2017. Standard Test Method for Moisture in the Analysis Sample of Coal and Coke. ASTM International, West Conshohocken, PA. www.astm. org.
3. ASTM D3174-12, 2012. Standard Test Method for Ash in the Analysis Sample of Coal and Coke from Coal, ASTM International, West Conshohocken, PA, 2012, www.astm.org.
4. ASTM D3175-17, 2017. Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke, ASTM International, West Conshohocken, PA, 2017, www.astm.org.
5. Illite crystallinity and coal metamorphism for selected central Appalachian coals and shales;Bayan;Int. J. Coal Geol.,2012