?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Ekholm%2C+Petri&rft.aulast=Ekholm&rft.aufirst=Petri&rft.date=2008&rft.title=Agricultural+phosphorus+losses+and+eutrophication+in+Nordic-Baltic+countries&rft.genre=proceeding