Koerner SE, Collins SL, Blair JM, Knapp AK, Smith MD. Rainfall variability has minimal effects on grassland recovery from repeated grazing. Journal of Vegetation Science. 2014;25:36 -44. doi:10.1111/jvs.12065.

Smith MD, Hartnett DC, Wilson GT. Interacting influence of mycorrhizal symbiosis and competition on plant diversity in tallgrass prairie. Oecologia. 1999;121:574 -582. doi:10.1007/s004420050964.