?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Cooper%2C+J.+M.&rft.aulast=Cooper&rft.aufirst=J.+M.&rft.date=2007&rft.title=Effect+of+organic%2C+low-input+and+conventional+production+systems+on+yield+and+diseases+in+winter+barley&rft.genre=proceeding