1. European Commission, Reducing emissions from transport. http://ec.europa.eu/clima/policies/transport/index_en.htm . Accessed 20 Feb 2015
2. European Commission, Transport. http://ec.europa.eu/clima/policies/international/paris_protocol/transport/index_en.htm . Accessed 20 Feb 2015
3. European Commission, Clean Trasnport, Urban Transport. http://ec.europa.eu/transport/themes/urban/index_en.htm . Accessed 20 Feb 2015
4. European Commission, Europe 2020—A strategy for smart, sustainable and inclusive growth. http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=COM:2010:2020:FIN:EN:PDF . Accessed 20 Feb 2015
5. Sydow TV, Kumer P, Wibbens B, Clèirigh SÓ, Ridaura G (2013) The European Union’s climate and energy 20/20/20 targets and the failure of energy efficiency objectives. Universitat Politecnical De Catalunya