1. Office of Technology Assessment Energy from Biological Processes Vol. II Technical and Environmental Analyses (052-003-00782-7 U.S. Government Printing Office Washington DC September 1980). Also published commercially by McGraw-Hill and Ballinger.
2. Bull T.E., chap. 26, Energy Sources: Conservation and Renewables (American Institute of Physics, New York, 1985)(chap.
3. “Renewable energy technology characterizations” (EPRI Topical Report TR-109496 Electric Power Research Institute Palo Alto CA December 1997) at http://erendev.nrel.gov/power/techchar.html “Overview of Biomass Technologies.”.
4. See www.eren.doe.gov/biopower.
5. www.eren.doe.gov.