Augustine, D.J., Dijkstra, F.A., Hamilton III, E.W. and Morgan, J.A. 2011. Rhizosphere interactions, carbon allocation, and nitrogen acquisition of two perennial North American grasses in response to defoliation and elevated atmospheric CO2. Oecologia 165: 755-770.

McGranahan, D.A. and Yurkonis, K.A. 2018. Variability in grass forage quality and quantity in response to elevated CO2 and water limitation. Grass and Forage Science 73: 517-521.

Morgan, J.A., LeCain, D.R., Read, J.J., Hunt, H.W. and Knight, W.G. 1998. Photosynthetic pathway and ontogeny affect water relations and the impact of CO2 on Bouteloua gracilis (C4) and Pascopyrum smithii (C3). Oecologia 114: 483-493.

Morgan, J.A., Skinner, R.H. and Hanson, J.D. 2001. Nitrogen and CO2 affect regrowth and biomass partitioning differently in forages of three functional groups. Crop Science 41: 78-86.