1. Baum, H., Pesch, St., 1994. Untersuchung der Eignung von Car-Sharing im Hinblick auf Reduzierung von Stadtverkehrsproblemen. Forschungsbericht FE-NT. 70421/93 im Auttrag des Bundesministers fur Verkehr, Universitaet Koeln, Koeln (unpublished), 194 pp.
2. Blaas, E.W., Vleugel, J.M., Louw, E., Rooijers, T., 1992. Autobezit, Autogebruik en Rijgedrag. Delft University Press, Delft, pp. 183.
3. Button, K., 1993. Transport, the Environment and Economic Policy. Edward Elgar, Aldershot, pp. 165.
4. Public use of autos: Mobility Enterprise Project;Doherty;J. Transp. Eng.,1987
5. Technical paradigms and technological trajectories: suggested interpretation of the determinants and directions of technological change;Dosi;Res. Policy,1982