1. Comisión Nacional del Mercado Eléctrico (CNSE), 1998. Informe de la propuesta de Real Decreto sobre producción de energı́a por instalaciones abastecidas por recursos o fuentes de energı́as renovables, residuos y cogeneración. Ref. I 029/98. Consejo de Administración de la CNSE. 14 de julio de 1998, Madrid.
2. European Commission, 1998. Green Paper on greenhouse emissions trading in the European Union, Brussels.
3. European Commission, 1999a. The shared analysis project. European Union Energy Outlook to 2020. Directorate-General for Energy, Brussels.
4. European Commission, 1999b. Proposal for a Directive of the European Parliament and of the Council on the Promotion of Electricity from Renewable Energy Sources in the Internal Electricity Market, Brussels.
5. European Commission, 2001. Proposal for a Directive on establishing a framework for greenhouse gas emissions trading within the European Community. COM (2001) 581, Brussels.