3Ampelas A. Automatic Fare Collection [ A]. 2001 IEEE Intelligent Transportation Systems Conference Proceedings [C].Oakland: IEEE, 2001: 1164-1166.
4Flühmann M, Daube K. Framework for Automatic Fare Collection [ A]. ASSCOM Technical White Paper Series [C].Switzerland: ASCOM, 1999: 1-18.
5Knorr E M. On Digital Money and Card Technologies [A]. University of British Columbia Technical Report 97-02 [C].UK: University of British Columbia, 1997:1-24
6Rescorla E. An Introduction to OpenSSL Programming [EB/OL]. www. linuxjournal.com/article/4822, 2001 -08-31.
7Zuberi K M, Shin K G S. ASmall-memory Real-time Micro-kernel [J]. Operating Systems Review, 1999, 33 (5):1-42.