1. European Commission. White paper for a community strategy and action plan—energy for the future: renewable sources of energy. COM(97)599 final, 1997.
2. EU Directive. Directive 2001/77/EC of the European Parliament and the Council of 27 September 2001 on the promotion of the electricity produced from renewable energy sources in the internal electricity market, 2001.
3. Communication from the European Commission. The support of electricity from renewable energy sources. COM(2005)627. Not published in the Official Journal, 2005.
4. ETSO. Report on renewable energy sources, 2003.
5. Eurelectric. A quantitative assessment of direct support schemes for renewables, 1st ed. 2004.