1. Increased loadings on digesters with recycle of digested solids;Pfeffer;Journal of Water Pollution Control Federation,1968
2. Processing organic solids by anaerobic fermentation;Pfeffer,1973
3. Reclamation of energy from organic refuse;Pfeffer,1974
4. Biological conversion of organic refuse to methane;Pfeffer,1974
5. Fuel gas production from solid wastes;Wise,1974