LeCain, D.R. and Morgan, J.A. 1998. Growth, gas exchange, leaf nitrogen and carbohydrate concentrations in NAD-ME and NADP-ME C4 grasses grown in elevated CO2. Physiologia Plantarum 102: 297-306.

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.