1. Bahl P, Padmanabhan VN (2000) RADAR: An in-building RF-based user location and tracking system (Vol. 2). Tel-Aviv, Israel: Proc. IEEE INFOCOM.
2. Cheng Y, Chawathe Y, LaMarca A, Krumm J (2005) Accuracy Characterization for Metropolitan-scale Wi-Fi Localization. Proceedings MobiSys 2005.
3. Haeberlen A, Flannery E, Ladd A, Rudys A (2004) Practical Robust Localization over Large- Scale 802.11 Wireless Networks. Philadelphia, PA: Proc. of the 10th ACM International Conference on Mobile Computing and Networking (MOBICOM).
4. Kaplan ED, Hegarty CJ (2006) Understanding GPS : principles and applications. Boston : Artech House.
5. Lee HK, Li B, Rizos C (2005) Implementation procedure of wireless signal map matching for location-based services. Proc. IEEE Int. Symposium Signal Processing and Information Tech.