?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Ewen%2C+C.&rft.aulast=Ewen&rft.aufirst=C.&rft.date=April+2012&rft.isbn=978-3-00-038263-5&rft.btitle=Study+concerning+the+safety+and+environmental+compatibility+of+hydrofracking+for+natural+gas+production+from+unconventional+reservoirs+(executive+summary).&rft.tpages=75&rft.genre=book