1. Carlson, R. W. & Bazzaz, F. A. in Environmental and Climatic Impact of Coal Utilisation (eds Singh, J. J. & Deepak, A.) 609–623 (Academic, New York, 1980).
2. Zangerl, A. R. & Bazzaz, F. A. Oecologia 62, 412–417 (1984).
3. Oechel, W. C. & Strain, B. R. in Direct Effects of Increasing Dioxide on Vegetation (eds Strain, B. R. & Cure, J. D.) 117–154 (USDE, Washington, 1985).
4. Oberbauer, S. F., Sionit, N., Hastings, S. J. & Oechel, W. C. Can. J. Bot. 64, 2993–2998 (1986).
5. Smith, S. D., Strain, B. R. & Sharkey, T. D. Functional Ecology 1, 139–143 (1987).