?url_ver=Z39.88-2004&rft_id=0596&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Humpherys%2C+Allan+S.&rft.aufirst=Allan+S.&rft.aulast=Humpherys&rft.volume=29&rft.title=Transaction+of+the+ASAE&rft.date=1986&rft.issue=6&rft.atitle=Energy+Dissipation+in+Low+Pressure+Irrigation+Pipelines.+I.+Butterfly+Valves+and+Discs&rft.pages=1685-1691&rft.genre=article