?url_ver=Z39.88-2004&rft_id=0171&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Lemon%2C+E.R.&rft.aulast=Lemon&rft.aufirst=E.R.&rft.date=1969&rft.pages=405-411&rft.volume=61&rft.issue=3&rft.atitle=Photosynthesis+Under+Field+Conditions.+XA.+Assessing+Sources+and+Sinks+of+Carbon+Dioxide+in+a+Corn+(Zea+mays+L.)+Crop+Using+Momentum+Balance+Approach&rft.title=Agronomy+Journal&rft.genre=article