Zhou Minglei, “The Enrichment Conditions and Resource Potential of Marine-Continental Transitional Coal-Measure Shale Gas: A Case Study of the Permo-Carboniferous Systerm in the Huanghebei Coalfield of North China”, Glob. J. Earth Sci. Eng., vol. 7, no. 1, pp. 22–36, Oct. 2020.