1. Steuart, D. R., in Oil Shales of the Lothians-part III;, Memoirs of the Geological Survey of Scotland (1912), p. 143.
2. Kerogen, Insoluble Organic Matter in Sedimentary Rocks;Durand,1980
3. Pyrolysis methods in organic geochemistry: An overview
4. Petroleum Geochemistry and Geology;Hunt,1979