http://www.foreignpolicy.com/articles/2012/12/26/polands_shale_gas_dream
http://pulitzercenter.org/reporting/poland-pennsylvania-energy-shale-gas-fracking-farming-water-bubble
http://www.vqronline.org/articles/unlikely-dissidents
http://chicagopolicyreview.org/2013/03/19/natural-gas-a-bubble-of-expectation/
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