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3. Directive 2003/54/EC of the European Parliament and the Council of 26 June 2003, concerning common rules for the internal market in electricity and repealing Directive 96/92/EC. http://europa.eu.int/eur-lex/pri/en/oj/dat/2003/l_176/l_17620030715en00370055.pdf .
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://eur-lex.europa.eu/LexUriServ/site/en/oj/2006/l_114/l_11420060427en00640085.pdf .
5. DIW (Deutsches Institut für Wirtschaftsforschung) Berlin, Forschungszentrum Jülich, Fraunhofer ISI, Öko-Institut (2005). Klimaschutz in Deutschland bis 2030. Endbericht zum Forschungsvorhaben Politikszenarien III. [Climate Protection in Germany up to the Year 2030. Final Report for Research Project “Policy Scenarios III“.] Berlin: Umweltbundesamt. http://www.umweltdaten.de/publikationen/fpdf-l/2822.pdf .