1. Energy Efficiency Indicators—The European Experience;Bosseboeuf,1999
2. Central Statistics Office, 2008. National Income and Expenditure Table 6. Available from: 〈www.cso.ie〉.
3. Commission of the European Communities, 1970. Council Directive 70/220/EEC of 20 March 1970 on the approximation of the laws of the Member States relating to measures to be taken against air pollution by gases from positive-ignition engines of motor vehicles.
4. Commission of the European Communities, 1980. Council Directive 80/1268/EEC of 16 December 1980 on the approximation of the laws of the Member States relating to the fuel consumption of motor vehicles.
5. Commission of the European Communities, 1999a. Commission recommendation of 5 February 1999 on the reduction of CO2 emissions from passenger cars (1999/125/EC).