Beerling, D.J. and Woodward, F.I. 1995. Leaf stable carbon isotope composition records increased water-use efficiency of C3 plants in response to atmospheric CO2 enrichment. Functional Ecology 9: 394-401.

Bunce, J.A. 1995. Long-term growth of alfalfa and orchard grass plots at elevated carbon dioxide. Journal of Biogeography 22: 341-348.

Harmens, H., Stirling, C.M., Marshall, C. and Farrar, J.F. 2000. Does down-regulation of photosynthetic capacity by elevated CO2 depend on N supply in Dactylis glomerata? Physiologia Plantarum 108: 43-50.

Nadas, E., Balogh, A., Kiss, F., Szente, K., Nagy, Z., Martinez-Carrasco, R. and Tuba, Z. 2008. Role of fructose-1,6-bisphosphatase, fructose phosphotransferase, and phosphofructokinase in saccharide metabolism of four C3 grassland species under elevated CO2. Photosynthetica 46: 255-261.

Szente, K., Nagy, Z. and Tuba, Z. 1998. Enhanced water use efficiency in dry loess grassland species grown at elevated air CO2 concentration. Photosynthetica 35: 637-640.