1. Hightower, J., Borriello, G.: Location systems for ubiquitous computing. In: Computer, vol. 34. IEEE Computer Society Press, Los Alamitos (2001)
2. Bonnifait, P., Bouron, P., Crubillé, P., Meizel, D.: Data fusion of fourABS sensors and GPS for an enhanced localization of car-like vehicles. In: Proc. of the IEEE International Conference on Robotics & Automation (2001)
3. Cui, Y., Ge, S.: Autonomous vehicle positioning with GPS in urban canyon environments. In: Proc. of the IEEE International Conference on Robotics & Automation (2001)
4. Ashbrook, D., Starner, T.: Learning significant locations and predicting user movement with gps. In: International Symposium onWearable Computing, Seattle, WA (2002)
5. Patterson, D., Etzioni, O., Fox, D., Kautz, H.: The Activity Compass. In: Proceedings of UBICOG 2002:First International Workshop on Ubiquitous Computing for Cognitive Aids (2002)