Iversen, C.M., Ledford, J. and Norby, R.J. 2008. CO2 enrichment increases carbon and nitrogen input from fine roots in a deciduous forest. New Phytologist 179: 837-847.

Johnson, D.W., Cheng, W., Joslin, J.D., Norby, R.J., Edwards, N.T. and Todd Jr., D.E.  2004.  Effects of elevated CO2 on nutrient cycling in a sweetgum plantation.  Biogeochemistry 69: 379-403.

Naumburg, E. and Ellsworth, D.S.  2000.  Photosynthetic sunfleck utilization potential of understory saplings growing under elevated CO2 in FACE.  Oecologia 122: 163-174.

Norby, R.J., Todd, D.E., Fults, J. and Johnson, D.W.  2001.  Allometric determination of tree growth in a CO2-enriched sweetgum stand.  New Phytologist 150: 477-487.

Norby, R.J., Hanson, P.J., O'Neill, E.G., Tschaplinski, T.J., Weltzin, J.F., Hansen, R.A., Cheng, W., Wullschleger, S.D., Gunderson, C.A., Edwards, N.T. and Johnson, D.W.  2002.  Net primary productivity of a CO2-enriched deciduous forest and the implications for carbon storage.  Ecological Applications 12: 1261-1266.

Norby, R.J., Sholtis, J.D., Gunderson, C.A. and Jawdy, S.S.  2003.  Leaf dynamics of a deciduous forest canopy: no response to elevated CO2.  Oecologia 10.1007/s00442-003-1296-2.

Norby, R.J., Ledford, J., Reilly, C.D., Miller, N.E. and O'Neill, E.G.  2004.  Fine-root production dominates response of a deciduous forest to atmospheric CO2 enrichment.  Proceedings of the National Academy of Sciences USA 101: 9689-9693.