1. Borken, J., Knörr, W., Höpfner, U., 2000. Energy consumption and pollutant emissions from road transport in Belgium 1980 to 2020. Institut für Energie und Umweltforschung Heidelberg GmbH (IFEU), Study commissioned by Fédération Belge de l’Industrie de l’ Automobile et du Cycle (FEBIAC), Heidelberg/Brussels, 41pp.
2. Estimation of road transportation emissions in Spain from 1988 to 1999 using COPERT III program, Polytechnic University of Madrid (UPM), School of Industrial Engineering (ETSII), Automobile Research Institute (INSIA);Burón;Atmospheric Environment,2004
3. Commission Directive 93/116/EC of 17 December 1993 adapting to technical progress Council Directive 80/1268/EEC relating to the fuel consumption of motor vehicles;Official Journal L,1993
4. Commission of the European Communities, 2000. Implementing the Community Strategy to Reduce CO2 Emissions from Cars. First annual report on the effecttiveness of the strategy. Communication from the Commission to the Council and the European Parliament. COM 615 final. Brussels, 8pp and 3 Annexes.
5. European Commission (Standard & Poor's DRIand KU Leuven), 1999. The AOP II cost effectiveness study part III: the transport base case. Report, 47pp and 9 Annexes.