1. Lim, H., Kung, L.-C., Hou, J. C., & Luo, H. (2006). Zero-configuration, robust indoor localization: Theory and experimentation. In Proceedings of IEEE INFOCOM.
2. Goodstein, L. (2004). Location based service: Analysis of carrier spending, subscribers, devices and applications for handset-based and telematics services. Report form ABI research, http://www.abiresearch.com .
3. Nogee, A. (2001). Ready or not, mobile location technology is here! Cahners In-Stat Group.
4. Golmie, N. (2001). Interference in the 2.4 ghz band. In Proceedings of International Conference on Applications and Services in Wireless Networks (pp. 187–199).
5. Ekahau positioning engine. http://www.ekahau.com/products/positioningengine .