1. EU Directive 2003/30/EC of yhe European Parliament and of the Council of May 8, 2003 on the promotion of the use of biofuels or other renewable fuels for transport. http://ec.europa.eu/energy/res/legislation/doc/biofuels/en_final.pdf/ [March 28, 2008].
2. Techno-economic evaluation of producing ethanol from softwood: Comparison of SSF and SHF and identifi cation of bottlenecks.;Wingren;Biotechnol Prog,2003
3. EU Strategy for Biofuels, Official Journal of the European Union. http://ec.europa.eu/agriculture/biomass/biofuel/com2006_34_en.pdf/ [March 28, 2008].
4. Use of U.S. croplands for biofuels increases greenhouse gasees through emissions from land use change.;Searchinger;Science,2008
5. EEA, State of Renewable Energies in Europe 2006. http://www.energiesrenouvelables.org/observer/stat_baro/barobilan/barobilan6.pdf/ [March 28, 2008].