1. Introduction to methane from biomass: a systems approach;Frank,1988
2. The prospects for biogas-A European point of view;Pankhurst;Biomass,1983
3. Biothermal gasification of biomass and organic residues;Chynoweth,1980
4. Sludge digestion and methane fermentation, Part 1. Increase solids concept;Schulze;Sewage and Industrial Wastes,1958
5. Future trend in digester design;Jewell,1979