1. Energy From Biomass;Buekens,1987
2. Industrial Charcoal Making;FAO Forestry Department;FAO Forestry Paper 63,1985
3. Fundamentals of Thermochemical Biomass Conversion;Jonsson,1985
4. Information on producer gas and Gas Producer Systems;Kaupp,1984
5. The Sixth European Conf. on Biomass for Energy, Industry and Environment;Evans,1991