Neufeld, Howard S., Seth J. Peoples, Alan W. Davidson, Arthur H. Chappelka, Greg L. Somers, Jill E. Thomley, and Fitzgerald L. Booker. "Ambient Ozone Effects on Gas Exchange and Total Non-Structural Carbohydrate Levels in Cutleaf Coneflower                        (Rudbeckia laciniata L.) Growing in Great Smoky Mountains National                        Park." Environmental Pollution 160, no. January (2012): 74-81.

Chappelka, Arthur H., Greg L. Somers, and James R. Renfro. "Temporal Patterns of Foliar Ozone Smptoms on Tall Milkweed (Asclepias exaltata L.) in Great Smoky Mountains National Park." Environmental Pollution 149, no. 3 (2007): 358-365.

Neufeld, Howard S., Arthur H. Chappelka, Greg L. Somers, Kent O. Burkey, Alan W. Davidson, and Peter L. Finkelstein. "Visible Foliar Injury Caused by Ozone Alters the Relationship between SPAD Meter Readings and Chlorophyll Concentrations in Cutleaf Coneflower." Photosynthesis Research 87, no. 3 (2006): 281-286.

Chappelka, Arthur H., Howard S. Neufeld, Alan W. Davison, Greg L. Somers, and James R. Renfro. "Ozone Injury on Cutleaf Coneflower (Rudbeckia laciniata) and Crown-Beard (Verbesina occidentalis) in Great Smoky Mountains National Park." Environmental Pollution 125, no. 1 (2003): 53-59.

Patterson, M. C., L. J. Samuelson, Greg L. Somers, and A. Mays. "Environmental Control of Stomatal Conductance in Forest Trees of the Great Smoky Mountains National Park." Environmental Pollution 110, no. 2 (2000): 225-233.

Chappelka, Arthur H., John M. Skelly, Greg L. Somers, James R. Renfro, and Elisabeth Hildebrand. "Mature Black Cherry Used as a Bioindicator of Ozone Injury." Water, Air, and Soil Pollution 116, no. 1-2 (1999): 261-266.

Chappelka, Arthur H., Greg L. Somers, and James R. Renfro. "Visible Ozone Injury on Forest Trees in Great Smoky Mountains National Park, USA." Water Air and Soil Pollution 116, no. 1-2 (1999): 255-260.

Chappelka, Arthur H., Greg L. Somers, James R. Renfro, and P. Rosseau. "Empirical Evidence of Growth Decline Related to Visible Ozone Injury." Forest Ecology and Management 104, no. 1-3 (1998): 129.

Chappelka, Arthur H., James R. Renfro, Greg L. Somers, and Bruce Nash. "Evaluation of Ozone Injury on Foliage of Black Cherry (Prunus serotina) and Tall Milkweed (Asclepias exaltata) in Great Smoky Mountains National Park." Environmental Pollution 95, no. 1 (1997): 13-18.