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3. Technically Recoverable Shale Oil and Shale Gas Resources: An Assessment of 137 Shale Formations in 41 Countries outside the United States http://www.eia.gov/analysis/studies/worldshalegas/ 2013
4. Industrial Policy of Shale Gas http://zfxxgk.nea.gov.cn/auto86/201310/t20131030_1715.htm 2013
5. Shale Gas: New Hope of Energy Development in China 2011