Bucher, J.B., Tarjan, D.P., Siegwolf, R.T.W., Saurer, M., Blum, H. and Hendrey G.R.  1998.  Growth of a deciduous tree seedling community in response to elevated CO2 and nutrient supply.  Chemosphere 36: 777-782.

Hattenschwiler, S.  2001.  Tree seedling growth in natural deep shade: functional traits related to interspecific variation in response to elevated CO2.  Oecologia 129: 31-42.

Hattenschwiler, S. and Korner, C.  2000.  Tree seedling responses to in situ CO2-enrichment differ among species and depend on understory light availability.  Global Change Biology 6: 213-226.

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.

Maillard, P., Guehl, J.-M., Muller, J.-F. and Gross, P.  2001.  Interactive effects of elevated CO2 concentration and nitrogen supply on partitioning of newly fixed ¹³C and ¹⁵N between shoot and roots of pedunculate oak seedlings (Quercus robur L.). Tree Physiology 21: 163-172.