?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Adler%2C+Steffen+A.&rft.aulast=Adler&rft.aufirst=Steffen+A.&rft.date=2006&rft.title=Early+or+Normal+Cut+Grass+Silage+for+Dairy+Cows+in+Organic+Farming+&rft.genre=proceeding