?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Lukashyk%2C+Pavel&rft.aulast=Lukashyk&rft.aufirst=Pavel&rft.date=2005&rft.title=Strategies+to+control+Cirsium+arvense+under+organic+farming+conditions&rft.genre=proceeding