?url_ver=Z39.88-2004&rft_id=doi%3A10.1046%2Fj.1365-2478.1999.00159.x&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=van+Gelderen%2C+Martin&rft.aulast=van+Gelderen&rft.aufirst=Martin&rft.issue=6&rft.volume=47&rft.date=November+1999&rft.issn=0016-8025&rft.atitle=Gravity+changes+and+natural+gas+extraction+in+Groningen&rft.title=Geophysical+Prospecting&rft.pages=979-993&rft.genre=article