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.
P. S. Doescher, Miller, R. F., and Winward, A. H.,
“Soil Chemical Patterns under Eastern Oregon Plant Communities Dominated by Big Sagebrush”,
Soil Science Society of America Journal, vol. 48, no. 3, p. 659, 1984.