?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Leinonen%2C+P.&rft.aulast=Leinonen&rft.aufirst=P.&rft.date=2004&rft.title=Lay-down+working+cart+improves+efficacy+of+hand+weeding&rft.genre=proceeding