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3. Energistyrelsen (Danish Energy Agency), 1999. Udredning om VE-bevismarkedet, December 1999 (Analysis of the RE certificate market). Homepage: http://www.ens.dk/El-gas-varme/Notater/Ve_udredning.pdf
4. European Commission, 2000a. Green paper, “Towards a European strategy for the security of energy supply”. COM(2000) 769 final, Brussels, 29 November 2000. Homepage: http://europa.eu.int/comm/energy_transport/en/lpi_en.html
5. European Commission, 2000b. Directive 2001/77/EC of the European Parliament and Council of 27 September 2001 on the promotion of electricity produced from renewable energy sources in the internal electricity market. Brussels.