1. Hall, D. O., Mynick, H. E. & Williams, R. H. Carbon Sequestration vs. Fossil Fuel Subscription: Alternative Roles for Biomass in Coping with Greenhouse Warming, PU/CEES Report No. 255 (Center for Energy and Environmental Studies, Princeton University, 1990).
2. Corman, J. C. Systems Analysis of Simplified IGCC Plants (US Department of Energy, Washington, DC, 1986).
3. Elliott, P. & Booth, R. Sustainable Biomass Energy (Shell International Petroleum, London, 1990).
4. Williams, R. H. & Larson, E. D. in Fuels and Electricity from Renewable Sources of Energy (eds Johansson, T. B., Kelly, H., Reddy, A. K. N. & Williams, R. H.) (Island, Washington, DC, in the press).
5. The Potential of Renewable Energy (Office of Policy Planning and Analysis, US Department of Energy, Washington, DC, 1990).