@book{188941,
	author = {Energy Information Administration, U.S. Department of Energy Department of Energy},
	title = {Technically Recoverable Shale Oil and Shale Gas Resources: An Assessment of 137 Shale Formations in 41 Countries Outside the United States},
	publisher = {EE.UU. DOE},
	year = {2013},
	url = {http://www.eia.gov/analysis/studies/worldshalegas/|http://www.eia.gov/analysis/studies/worldshalegas/pdf/fullreport.pdf}
}