1. Anonymous, 1988. Speeding biodegradation – the Aquasan® process. Water and Waste Treatment. Project Report, Environmental Products, D&M Hudson, UK (December, circle 5)
2. Chawla, O.P., 1986. Methane fermentation technology. In: Advances in Biogas Technology. Indian Council of Agricultural Research, New Delhi, India, pp. 19–57
3. Goering, H.K., Van Soest, P.J., 1970. Forage fibre analysis. Agricultural Handbook No 379. USDA, Washington, DC
4. Hobson, P.N., Bousfield, S., Summers, R., 1981. Methane production from agricultural and domestic wastes. In: Andrew P. (Ed.), Applied Science Publishers, Barking, England, 269 pp
5. Jewell, W.J., Davis, H.R., Gunkel, W.W., Lathwell, D.J., Martin Jr., J.H., McCarty, T.R., Morris, G.R., Price, D.R., William, D.W., 1976. Final Report TID-27164: Bioconversion of Agricultural Wastes for Pollution Control and Energy Conservation, Cornell University, Ithaca, New York (Personal Communication), 321 pp