L. Horrigan, R. S. Lawrence and P. Walker, “How Sustainable Agriculture Can Address the Environmental and Human Health Harms of Industrial Agriculture,” Environmental Health Perspectives, Vol. 110, No. 5, 2002, pp. 445-456. doi:10.1289/ehp.02110445
 S. Ghosh, E. R Vieitez, T. Liu and Y. Kato, “Biogasification of Solid Waste by Two Phase Anaerobic Fermentation,” Proceedings of the 3rd Biomass Conference of the Americas, Vol. 2, Montréal, 24-29 August 1997.
 E. Kwon, J. W. Kelly and J. C. Marco, “An Investigation into the Syngas Production from Municipal Solid Waste (msw) Gasification under Various Pressures and CO2 Concentration Atmospheres,” Proceedings of the 17th Annual North American Waste-to-Energy Conference, Chantilly, 18-20 May 2009, pp. 231-236. doi:10.1115/NAWTEC17-2351
 M. Macias-Corral, Z. Samani, A. Hanson, G. Smith, P. Funk, H. Yu and J. Longworth, “Anaerobic Digestion of Municipal Solid Waste and Agricultural Waste and the Effect of Co-Digestion with Dairy Cow Manure,” Bioresource Technology, Vol. 99, No. 17, 2008, pp. 8288-8293. doi:10.1016/j.biortech.2008.03.057
 C. Sherrington, J. Bartley and D. Moran, “Farm-Level Constraints on the Domestic Supply of Perennial Energy Crops in the UK,” Energy Policy, Vol. 36, No. 7, 2008, pp. 2504-2512. doi:10.1016/j.enpol.2008.03.004
 V. Skoulou, N. Mariolis, G. Zanakis and A. Zabaniotou, “Sustainable Management of Energy Crops for Integrated Biofuels and Green Energy Production in Greece,” Renewable and Sustainable Energy Reviews, Vol. 15, No. 4, 2011, pp. 1928-1936. doi:10.1016/j.rser.2010.12.019