?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Kasyanova%2C+Dr+E&rft.aulast=Kasyanova&rft.aufirst=E&rft.date=2006&rft.title=Intercropping+with+grain+legumes+increases+N+and+S+concentration+and+N%3AS+ratios+of+wheat+grain+in+European+organic+farming+systems&rft.genre=proceeding