1. D7569–10: Standard Practice for Determination of Gas Content of Coal-Direct Desorption Method;American Society for Testing Materials,2010
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3. Direct Method Determination of the Gas Content of Coal: Procedures and Results, Report of Investigations 8515;Diamond,1981
4. Results of Direct-Method Determination of the Gas Content of US Coalbeds;Diamond,1986
5. Influence of matrix shrinkage and compressibility on gas production from coalbed methane reservoirs;Harpalani,1990