?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Thorup-Kristensen%2C+Kristian&rft.aulast=Thorup-Kristensen&rft.aufirst=Kristian&rft.date=2006&rft.title=Cropping+systems+with+winter+wheat+or+spring+wheat%3F+Root+growth%2C+catch+crops%2C+nitrogen+leaching+and+baking+quality&rft.genre=proceeding