McDonnell, Todd C., Timothy J. Sullivan, Paul F. Hessburg, Keith M. Reynolds, Nicholas A. Povak, Bernard J. Cosby, William Jackson, and R. Brion Salter. "Steady-State Sulfur Critical Loads and Exceedances for Protection of Aquatic Ecosystems in the U.S. Southern Appalachian Mountains." Journal of Environmental Management 146 (2014): 407-419.