Carbon gain and bud physiology in Populus tremuloides and Betula papyrifera grown under long-term exposure to elevated concentrations of CO2 and O3.

Riikonen, J.; Kets, K.; Darbah, J.; Oksanen, E.; Sôber, A.; Vapaavuori, E.; Nelson, N.; Kubiske, M.; Karnosky, D. (2008)