Beerling, D.J., Heath, J., Woodward, F.I. and Mansfield, T.A.  1996.  Drought-CO2 interactions in trees: observations and mechanisms.  New Phytologist 134: 235-242.

Beerling, D.J. and Woodward, F.I.  1996.  In situ gas exchange responses of boreal vegetation to elevated CO2 and temperature: first season results.  Global Ecology and Biogeography Letters 5: 117-127.