1. Asphalts and Allied Substances;Abraham,1945
2. Hydroprocessing of Heavy Oils and Residua;Ancheyta,2007
3. Standard test method for API gravity of crude petroleum and petroleum products (hydrometer method);ASTM D287,2017
4. Standard test method for bitumen content;ASTM D4,2017
5. Standard terminology relating to petroleum, petroleum products, and lubricants;ASTM D4175,2017