http://www.re.sandia.gov

http://www.windpower.com

http://www.cepis.ops-oms.org/bvsatp/e/calent.htm

http://www.censolar.org

http://energy.org.ar/index1_files/PROYARG/WWW/nconvenc.htm#LINKS

http://www.appa.es/dch/que_son_eerr.htm

http://www.concytec.gob.pe

http://www.otrasenergias.com/

http://www.eere.energy.gov/redirects/consumerinfo.html

www.ott.doe.gov/biofuels

www.journeytoforever.org/biofuel.html

http://www.renovables.com/

www.biodiesel.org

http://www.biodiesel.com.br/principal.htm

http://www.cipav.org.co/cipav/resrch/energy/alvaro1.htm

http://www.librys.com/biocombustibles/

http://www.biogasworks.com/

http://www.codeso.com/Biogas1.html

http://www.re-energy.ca/t-i_biomassbuild-1.shtml

http://www.eco-gel.com/digestion_anaerobia.htm

http://www.cps.unizar.es/~isf/indices/biomasa.html

http://www.cps.unizar.es/~isf/html/bigen01.html

http://medioambiente.geoscopio.com/medioambiente/temas/tema10/index.php