1. https://ec.europa.eu/clima/policies/transport_en.
2. Regulation (EU) 2019/631 of the European Parliament and of the Council of 17 April 2019 setting CO2 emission performance standards for new passenger cars and for new light commercial vehicles, and repealing Regulations (EC) No 443/2009 and (EU) No 510/2011.
3. Regulation (EU) 2019/1242 of the European Parliament and of the Council of 20 June 2019 setting CO2 emission performance standards for new heavy-duty vehicles and amending Regulations (EC) No 595/2009 and (EU) 2018/956 of the European Parliament and of the Council and Council Directive 96/53/EC.
4. International Council on Clean Transportation, – August 2011 - Global Passenger Vehicles Program - Global Comparison of Light-Duty Vehicle Fuel Economy/GHG Emissions Standards.
5. University of Technology Graz, Institute for Internal Combustion Engines and Thermodynamics (2012) Reduction and Testing of Greenhouse Gas Emissions from Heavy Duty Vehicles (LOT 2) - Development and testing of a certification procedure for CO2 emissions and fuel consumption of HDV - Contract N° 070307/2009/548300/SER/C3, Final Report, 9 January 2012.