1. R.E.H. Sims, in: N.E. Bassam, R.K. Behl, B. Prochnow (Eds.), Proceedings of the International Conference on Sustainable Agriculture for Food, Energy and Industry, James and James, London, 1997, p. 748.
2. R.E.H. Sims, The Brilliance of Bioenergy: in Business and in Practice, James and James, London, 2002.
3. J. Houghton, Energy and Transportation for the Future, Global Warming: the Complete Briefing, Cambridge University Press, Cambridge, 1994, p. 189.
4. M. Kaltschmitt, in: A.V. Bridgwater (Ed.), Biomass Gasification and Pyrolysis: State of the Art and Future Prospect, CPL Press, Berkshire, 1997.
5. A.V. Bridgwater, Fast Pyrolysis of Biomass: A Handbook, vols. 1 and 2, CPL Press, Berkshire, 2002.