1. Angermann, M., Kammann, J., Robertson, P., Steingaβ, A., Strang, T.: Software representation for heterogeneous location data sources within a probabilistic framework. In: International Symposium on Location Based Services for Cellular Users, Locellus, pp. 107–118 (2001)
2. Lecture Notes in Computer Science;C. Böhm,1999
3. Bohn, J., Vogt, H.: Robust Probabilistic Positioning Based on High-Level Sensor-Fusion and Map Knowledge, Technical Report nr. 421, ETH Zurich (April 2003)
4. Getting, I.: The Global Positioning System. IEEE Spectrum 30(12), 36–47 (1993)
5. Galileo Project Webpage,
http://europa.eu.int/comm/dgs/energy_transport/galileo/index_en.htm