?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.date=2007&rft.btitle=Improving+Sustainability+in+Organic+and+Low+Input+Food+Production+Systems.+Proceedings+of+the+3rd+International+Congress+of+the+European+Integrated+Project+Quality+Low+Input+Food+(QLIF).+University+of+Hohenheim%2C+Germany%2C+March+20+%C3%A2%C2%80%C2%93+23%2C+2007&rft.genre=book