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M. L. Pokorny, Sheley, R., Zabinski, C. A., Engel, R. E., Svejcar, T., and Borkowski, J. J.,
“Plant Functional Group Diversity as a Mechanism for Invasion Resistance”,
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K. W. Davies, Pokorny, M. L., Sheley, R., and James, J. J.,
“Influence of Plant Functional Group Removal on Inorganic Soil Nitrogen Concentrations in Native Grasslands”,
Rangeland Ecology & Management, vol. 60, no. 3, pp. 304 - 310, 2007.