1. Cooper JS (2003) Specifying functional units and reference flows for comparable alternatives. Int J Life Cycle Assess 8:337–349
2. DaimlerChrysler AG (2007) Umwelt-Zertifikat Mercedes C-Klasse. DaimlerChrysler AG / Mercedes Car Group, Stuttgart
3. Eberle R (2000) Methodik zur ganzheitlichen Bilanzierung im Automobilbau. Technische Universität Berlin (TU), Berlin
4. European Economic Community (1970) Council Directive 70/220/EEC of 20 March 1970 on the approximation of the laws of the Member States on measures to be taken against air pollution by emissions from motor vehicles
5. European Economic Community (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