1Scott A R. Composition and origin of coalbed gases from selected basins in the United States[A]. In: Proceedings of the 1993 International Coalbed Methane Symposium[C]. The University of Alabama, School of Mines and Energy Development, Paper 9270, 1993, 1: 174- 186.
2Rice D D. Composition and origins of coalbed gas[A]. In: Law, B.E., Rice, D.D. (Fds.), Hydrocarbons from coal[C]. AAPG Studies in Geology, 1993, 38:159- 184.
3Peters K E, Moldowan J M. The Biomarker Guide [ M ]. Prentice Hall, Englewood Cliffs. 1993,1 - 50.
4Orisson G , Albrecht P , Rohmer M. Predictive microbial biogeochemistry and biochemistry of a group of natural products [ J ]. Pure Applied Chemistry, 1982, 51:09 - 729.