Bryant, J., Taylor, G. and Frehner, M.  1998.  Photosynthetic acclimation to elevated CO2 is modified by source:sink balance in three component species of chalk grassland swards grown in a free air carbon dioxide enrichment (FACE) experiment.  Plant, Cell and Environment 21: 159-168.

Ferris, R. and Taylor, G.  1995.  Contrasting effects of elevated CO2 and water deficit on two native herbs.  New Phytologist 131: 491-501.

Niklaus, P.A. and Korner, C.  2004.  Synthesis of a six-year study of calcareous grassland responses to in situ CO2 enrichment.  Ecological Monographs 74: 491-511.