?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Zeltner%2C+Esther&rft.aulast=Zeltner&rft.aufirst=Esther&rft.date=2008&rft.title=Evaluation+of+Laying+Hen+Strains+for+biodynamic+Farms&rft.genre=proceeding