1. Balijepalli, N., Shepherd, S., May, A., 2008. Comparing Benefits between Cordon and Area-Based Road Pricing Schemes and Optimising the Benefits. Report Produced as part of the DISTILLATE Project (http://www.distillate.ac.uk). (retrieved 07.10.13.
2. Discrete Choice Analysis: Theory and Application to Travel Demand;Ben-Akiva,1985
3. Chakroborty, P., Kikuchi, S., 1990. Application of fuzzy set theory to the analysis of capacity and level of service of highways. In: Proceedings of First International Symposium on Uncertainty Modeling and Analysis, pp. 146–150.
4. Survey of technologies for the implementation of national-scale road user charging;Cottingham;Transport Rev.,2007
5. The Fuzzy Systems Handbook: A Practioner’s Guide to Building Using, and Maintaining Fuzzy Systems;Cox,1999