1. A pilot index for environmental policy in The Netherlands;Butter;Energy Policy,1998
2. Colombo, U., 1992. Sustainable energy development. Science and Sustainability: Selected Papers on IIASA's 20th Anniversary, International Institute for Applied Systems Analysis, Luxemburg, Austria.
3. Economic growth and the environment;Grossman;Quarterly Journal of Economics,1995
4. Industrial Pollution in Economic Development;Hettige,1997
5. International Energy Agency, 1997. CO2 emissions from Fuel Combustion, 1972–1995, Paris.