@article {6105, title = {Visible Foliar Injury Caused by Ozone Alters the Relationship between SPAD Meter Readings and Chlorophyll Concentrations in Cutleaf Coneflower}, journal = {Photosynthesis Research}, volume = {87}, year = {2006}, month = {March}, pages = {281-286}, keywords = {Air pollution, Flowering plants, Ozone}, author = {Neufeld, Howard S and Chappelka, Arthur H and Somers, Greg L and Burkey, Kent O and Davidson, Alan W and Finkelstein, Peter L} }