Souza, Lara, Howard S. Neufeld, Arthur H. Chappelka, Kent O. Burkey, and Alan W. Davison. "Seasonal Development of Ozone-Induced Foliar Injury on Tall Milkweed (Asclepias exaltata) in Great Smoky Mountains National Park." Environmental Pollution 141, no. 1 (2006): 175-183.