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Characteristics of Porosity and Permeability and Their Geological Control of Permo-Carboniferous Coals in North China
LIU Da-meng, YAO Yan-bin, CAI Yi-dong, ZHANG Bai-ren, ZHANG Ke-ming, LI Jun-qian
Geoscience . 2010, (6): 1198 -1203 . 

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