1. EPA, Methane and Nitrous Oxide Emissions from Natural Sources, U.S. Environmental Protection Agency, Washington, DC, USA, 2010.
2. Effects of thermal and mechanical pretreatments of secondary sludge on biogas production under thermophilic conditions;Climent;Chem. Eng. J.,2007
3. F. Monnet, An Introduction to Anaerobic Digestion of Organic Wastes, Final Report. (2003), pp. 1–43.
4. Sludge Engineering: The Treatment and Disposal of Wastewater Sludges;Sanin,2011
5. Methane fermentation of energy crops: maximum conversion kinetics and in situ biogas purification;Jewell;Biomass Bioenergy,1993