1. Abowd, G.D., Atkeson, C.G., Hong, J., Long, S., Kooper, R., Pinkerton, M.: Cyberguide: A mobile context-aware tourguide. ACM Wireless Networks, 421–433 (1997)
2. Ashbrook, D., Starner, T.: Learning signifcant locations and predicting user movement with GPS. In: Proc. of 6th IEEE Intl. Symp. on Wearable Computers (2002)
3. Asthana, A., Cravatts, M., Krzyzanouwski, P.: An Indoor Wireless System for Personalized Shopping Assistance. In: Proceedings of IEEE Workshop on Mobile Computing Systems and Applications, pp. 69–74. IEEE Computer Society Press, Los Alamitos
4. Bahl, P., Padmanabhan, V.N.: RADAR: An In-Building RF Based User Location and Tracking System. In: INFOCOM 2000, pp. 775–784 (2000)
5. Bahl, P., Padmanabhan, V.N.: A Software System for Locating Mobile Users: Design, Evaluation, and Lessons. MSR Technical Report (2000)