1. Bhattacharya SC, Abdul Salam P (2006) A review of selected biomass energy technologies: gasification, combustion, carbonization and densification, A publication of Asian Regional Research Programme in Energy, Environment and Climate (ARRPEEC), April 2006
2. Beck F, Martinot E (2004) Renewable energy policies and barriers. In: Encyclopedia of energy, pp 365–383, Elsevier science, 2004
3. Commission Staff Working Document (2004) The share of renewable energy in the EU, Country Profiles, Overview of Renewable Energy Sources in the Enlarged European Union, Brussels, 2004
4. Directive 2006/32/EC of the European Parliament and of the Council of 5 April 2006 on energy end-use efficiency and energy services and repealing Council Directive 93/76/EEC, http://europa.eu.int/eur-lex/lex/LexUriServ/site/en/oj/2006/l_114/l_11420060427en00640085.pdf
5. EU Council Decision of 8 March (2007)