@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}
}
@article {3117,
	title = {Visible Ozone Injury on Forest Trees in Great Smoky Mountains National Park, USA},
	journal = {Water Air and Soil Pollution},
	volume = {116},
	year = {1999},
	month = {November},
	pages = {255-260},
	keywords = {Cove Mountain, Ecosystem, Ozone},
	url = {http://www.springerlink.com/content/j014vr70431r11t7/},
	author = {Chappelka, Arthur H and Somers, Greg L and Renfro, James R}
}
