?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Messner%2C+S.&rft.aulast=Messner&rft.aufirst=S.&rft.date=1994&rft.title=The+future+of+natural+gas+in+Europe&rft.genre=proceeding