K. W. Davies,
“Plant community diversity and native plant abundance decline with increasing abundance of an exotic annual grass”,
Oecologia, vol. 16714214191110543932823106163301961594812331412628133868725715636528887108896541610014291471041181818809493961521, no. 2, pp. 481 - 491, 2011.
B. Fajemisin, Ganskopp, D. C., Cruz, R., and Vavra, M.,
“Potential for Woody Plant Control by Spanish Goats in the Sagebrush Steppe”,
Small Ruminant Research, vol. 20, no. 2, pp. 99 - 107, 1996.