?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Groot%2C+S.P.C.&rft.aulast=Groot&rft.aufirst=S.P.C.&rft.date=2006&rft.title=The+need+for+a+supply+of+high+quality+organic+vegetable+seeds&rft.genre=proceeding