Scott A R. 1993. Composition and origin of eoalbed gases from selected basins in the United States. In:Proceedings of the 1993 International Coalbed Methane Symposium,209-222.
Bryant M P. 1979. Microbial methane production- theoretical aspects. JWPCF, 48:193-201.
[21]
Galimov E M. 1980. 12C/13 C in kerogens. In: Durand B, ed. Kerogen. Paris:Technip,198-211.
[22]
Harpalani S, Shraufnagel R A. 1990. Shrinkage of coal matrix with release of gas and its impact on permeability of coal. Fuel, 69: 551-556.
[23]
Karweil J. 1969. Aktuelle problem der geochemic der kohle. In: Schenk P A, Havernaar I, eds. Advances in Geochemistry. Oxford: Pergamon Press, 59-84.
[24]
Rice D D. 1993. Composition and origins of coalbed gase. In. Law B E, Rice D D, eds, Hydrocarbons from Coal. AAPG Studies in Geology 38, Tulsa, OK, 159-184.