1. Overview of government and market driven programs for the promotion of renewable power generation;Ackermann;Renewable Energy,2001
2. Use of economic instruments in the German renewable electricity policy;Agnolucci;Energy Policy,2006
3. Avellaner Lacal, J., 2001. Interview, Chief Department of Public Programs Management, Institute of Energy Saving and Diversification (IDAE), May 2001.
4. Bechberger, M., Reiche, D., 2004. The spread of renewable energy feed-in tariffs in the EU-25, downloaded at 〈http://wind-works.org/articles/feed_laws.html〉, on 22 May 2008.
5. Renewable energy policies in the European Union;Blok;Energy Policy,2006