?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Vanhala%2C+P.&rft.aulast=Vanhala&rft.aufirst=P.&rft.date=2004&rft.title=Guidelines+for+physical+weed+control+research%3A+flame+weeding%2C+weed+harrowing+and+intra-row+cultivation+&rft.genre=proceeding