Heath, J., Ayres, E., Possell, M., Bardgett, R.D., Black, H.I.J., Grant, H., Ineson, P. and Kerstiens, G.  2005.  Rising atmospheric CO2 reduces sequestration of root-derived soil carbon.  Science 309: 1711-1713

Kreuzwieser, J., Rennenberg, H. and Steinbrecher, R. 2006. Impact of short-term and long-term elevated CO2 on emission of carbonyls from adult Quercus petraea and Carpinus betulus trees. Environmental Pollution 142: 246-253.