1. Directive 2009/33/EC of the European Parliament and the Council of 23 April 2009 on the promotion of clean and energy-efficient road transport vehicles;Off. J. Eur. Union,2009
2. Proposal for a Council Directive on Passenger Car Related Taxes,2005
3. http://ec.europa.eu/governance/impact/commission_guidelines/docs/iag_2009_en.pdf
4. European Automotive Industry Advocates Harmonized CO2-Related Taxation of Cars and of Alternative Fuels in the EUhttp://www.acea.be/