?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=J%C3%83%C2%B8rgensen%2C+R.B.&rft.aulast=J%C3%83%C2%B8rgensen&rft.aufirst=R.B.&rft.date=2007&rft.title=Co-existence+with+GM+crops%3A+grasses%2C+clover+and+fodder+beet&rft.genre=proceeding