ID	Reference
Ellsworth et al, 2004	Ellsworth D. S., Reich P. B., Naumburg E. S., Koch G. W., Kubiske M. E., Smith, S. D., Photosynthesis, carboxylation and leaf nitrogen responses of 16 27 species to elevated pCO2 across four free-air CO2 enrichment experiments in forest, grassland and desert, Global Change Biology, 2004, 10(12): 2121-2138.