?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Seuri%2C+P.&rft.aulast=Seuri&rft.aufirst=P.&rft.date=2004&rft.title=Nitrogen+balance+and+self-sufficiency+on+dairy+cattle+farms+in+northern+conditions&rft.genre=proceeding