1. E. Kaplan, C. Hegarty, Understanding GPS: Principles and Applications. Artech House, Inc., 2005.
2. M. Anisetti, C. A. Ardagna, V. Bellandi, E. Damiani and S. Reale, Map-based location and tracking in multipath outdoor mobile networks, IEEE Transactions on Wireless Communications, Vol. 10, No. 3, pp. 814–824, 2011.
3. J. H. Kim, K. S. Min, W. Y. Yeo, A design of irregular grid map for large-scale Wi-Fi LAN fingerprint positioning systems, The Scientific World Journal, Vol. 2014, ID 203419, 2014.
4. X. Liu, S. Zhang, J. Quan, X. Lin, The experimental analysis of outdoor positioning system based on fingerprint approach. In 12th IEEE International Conference on Communication Technology (ICCT), pages 369–372, Nanjing, China, 2010.
5. M. Yousief, Horus: A WLAN-Based Indoor Location Determination system, in PhD thesis, University of Maryland, 2004.