?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Melander%2C+Bo&rft.aufirst=Bo&rft.aulast=Melander&rft.title=The+dynamics+of+Cirsium+arvense+and+Elytrigia+repens+in+long-termed+organic+crop+rotation+experiments+&rft.date=March+2014&rft.genre=proceeding