[66] Zie bijvoorbeeld Egenhofer, C. Legge, T., 2002: Greenhouse Gas Emissions in Europe, Conditions for Environmental Credibility and Economic Efficiency, CEPS Task Force Report N. 43, Brussel: Centrum voor Europese Beleidsstudies.
[66] Siehe z.B. Egenhofer, C. and Legge, T., 2002: Greenhouse Gas Emissions in Europe, Conditions for Environmental Credibility and Economic Efficiency, CEPS Task Force Report N. 43, Brussels: Centre for European Policy Studies.