[66] Voir par exemple Egenhofer, C. et Legge, T., 2002: Greenhouse Gas Emissions in Europe, Conditions for Environmental Credibility and Economic Efficiency, CEPS Task Force Report N. 43, Bruxelles: Centre for European Policy Studies.
[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.