1. Acock, B. and Hand, D. W. (1975). The effect of day temperature and CO2concentration on net photosynthesis.Report of the Glasshouse Crops Research Institute for 1974, 49–51.
2. Hand, D. W., Slack, G. and Sweeney, D. G. (1981). Lettuce crop responses to controlled levels of CO2enrichment.Report of the Glasshouse Crops Research Institute for 1979, 58–9.
3. Lane, P., Galway, N. and Alvey, N. (1988).Genstat 5. An introduction.Oxford University Press, Oxford.
4. Law, R. and Mansfield, T. A. (1982). Oxides of nitrogen and the greenhouse atmosphere. In:Effects of gaseous air pollutants in agriculture and horticulture.(Unsworth, M. H. and Ormrod, D. P., Eds). Butterworths, London, 93–112.
5. Sheard, G. F. (1965). A glasshouse unit for multifactorial experiments.Report of the Glasshouse Crops Research Institute for 1964, 155–9.