1. Kruppa, M.: Benutzer-Lokalisierung in unterschiedlichen Umgebungen. In: Ambient Assisted Living 2010 (2010)
2. Hui, L., Houshang, D., Pat, B., Jing, L.: Survey of wireless Indoor Positioning Techniques and Systems (2007)
3. Hightower, J., Borriello, G.: Location systems for ubiquitous computing. Computer 34, 57–66 (2001)
4. Küpper, A.: Location-Based Services: Fundamentals and Operation. Wiley, Chichester (2005)
5. Li, B., Salter, J., Dempster, A.G., Rizos, C.: Indoor positioning techniques based on wireless LAN. In: LAN, First IEEE International Conference on Wireless Broadband and ultra Wideband Communications, pp. 13–16 (2007)