Brozostek ER, Blair JM, Dukes JS, et al. The effect of experimental warming and precipitation change on proteolytic enzyme activity: positive feedbacks to nitrogen availability are not universal. Global Change Biology. 2012;18:2617 -2625. doi:10.1111/j.1365-2486.2012.02685.x.

Knapp AK, Smith MD, Hobbie SE, et al. Past, present, and future roles of long-term experiments in the LTER Network. Bioscience. 2012;62:377 -389. doi:10.1525/bio.2012.62.4.9.

Parton WJ, Coughenour MB, Scurlock JMO, et al. Global grassland ecosystem modelling: development and test of ecosystem models for grassland systems. In: Breymeyer AI, Hall DO, Melillo JM, Agren GI Global Change: Effects on Coniferous Forests and Grasslands. Global Change: Effects on Coniferous Forests and Grasslands. Chichester: Wiley and Sons; 1996:229 -270.

Ojima DS, Parton WJ, Coughenour MB, et al. Impact of climate and atmospheric carbon dioxide changes on grasslands of the world. In: Breymeyer AI, Hall DO, Melillo JM, Agren GI Global Change: Effects on Coniferous Forests and Grasslands. Global Change: Effects on Coniferous Forests and Grasslands. Chichester: Wiley and Sons; 1996:271 -312.