1. Generation, accumulation, and resource potential of biogenic gas;Rice;Am. Assoc. Pet. Geol. Bull.,1981
2. Unconventional shallow biogenic gas systems;Shurr;Am. Assoc. Pet. Geol. Bull.,2002
3. Distribution of carbon in crust of earth;Hunt;AAPG Bull.,1972
4. Petroleum Geochemistry and Geology;Hunt,1996
5. Petroleum Formation and Occurrence; A New Approach to Oil and Gas Exploration;Tissot,1978