|| B.Parkinson and J. Spillker, Global Positioning System: Theory and Application. American Institute of Astronautics Aeronautics, 1996.|
 E.Kaplan, Understanding GPS Principles and Applications Artech House, 1996.
 B.Hofmann-Wellenhof, H. Lichtenegger, and J. Collins, “Global Positioning System,” Proceedings of the Theory and Practice, Springer Verlag, 1997.
 J. Hill et al., “System architecture directions for networked sensors,” ASPLOS-LX, November 2000, Cambridge, MA.
 Jason. Hill, Robert Szewczyk, Alec Woo, Seth Hollar, David Culler, and Kristofer Pister, “System architecture directions for networked sensors,” Proceedings of the 9th International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS 2000),pp.93-104, Cambridge, MA, November 2000.
 N. Adams, R. Gold, B. N. Schilit, M. Tso, and R. Want. “An Infrared Network for Mobile Computers,” Proceedings of the USENIX Symposium on Mobile and Location-independent Computing, Cambridge, MA, pp.41-52, Aug. 1993.
 F. Bennett and A. Harter. "Low Bandwidth Infra-Red Networks and Protocols for Mobile Communicating Devices," Oracle Research Lab (ORL) Technical Report, May 93.
 SMART DUST Autonomous sensing and communication in a cubic millimeter, http://robotics.eecs.berkeley.edu/~pister/SmartDust/
 J.M. Kahn, R. H. Katz, and K. S. J. Pister, “Next Century Challenges: Mobile Networking for Smart Dust,” Proc. ACM MobiCom ’99, Washington, DC, 1999, pp-271-78.
 J. Bensche, J. Cooke, E. Job, T. Luke, J. Kvaal, and N. Swatland, “Investing in The Wireless Location Services Market,” Lehman Brothers Report, Sep. 2000.
 K. Pahlavan, and X. Li, “Indoor Geolocation Science and Technology,” IEEE Communications Mazagine, Vol. 40, no. 2, p.112-118, Feb. 2002.
 H. Hashemi, “The Indoor Radio Propagation Channel,” Proceedings of the IEEE, Vol. 81, no. 7, pp. 943-968, Jul. 1993.
 K. Pahlavan, P.Krishnamurthy, and J. Beneat, “Wideband Radio Propagation Modeling for Indoor Geolocation Applications,” IEEE Communications Mazagine, Vol. 36, no. 4, pp.60-65, Apr. 1998.
 Nissanka B. Priyanth, Anit Chakraborty, and Hari Balakrishnan, “The Cricket Location-Support System,” Proceedings of 6th Annual ACM/IEEE International Conference on Mobile Computing and Networking (MobiCom 2000), pp. 32-43, Boston, MA, August 2000.
 A. Svvides, C.-C. Han, and M. Srivastava, “Dynamic Fine-grained Localization in Ad-hoc Network of Sensors,” ACM MOBICOM, Rome, ltaly, 2001.
 Y. Shang et al., “Localization from Mere Connectivity,” ACM MOBIHOC, Annapdis, MD, June 1-3 2003.
 D. Niculescu and B. Nath, “Position and Orientation in Ad Hoc Networks,” Elsevier Ad Hoc Networks, vol. 2, no. 2, Apr. 2004, pp. 133-51.
 R. Want, A. Hopper, V. Falcao, and J. Gibbons, “The active badge location system,” ACM Trans. Inform, Syst, vol. 10, pp.91-102, Jan. 1992.
 R. Want, A. Hopper, V. Falcao, J. Gibbons. "The Active Badge Location System," ACM Transactions on Information Systems, Vol. 10, No. 1, pp.91-102, Jan. 1992.
 “Radio Frequency Identification – RFID: A basic primer,” v.1.11, an AIM white paper, Sep. 28, 1999.
 “Crossbow Technology, Inc.” http://www.crossbow.com.
 J. Hill, R. Szewczyk, A. Woo, S. Hollar, D. Culler, and K. Pister, “System architecture directions for networked sensors,” in Architectural Support for Programming Languages and Operating Systems, November 2000, pp. 93-104.
 ETSI Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Service description: Stage 2, GSM recommendation 03.60,1999.
 3GPP, “Technical Specification Group Services and System Aspects, ” General UMTS Architecture,” 3GPP TS 23.101 V4.0.0 (2001-04), 2001.
 3GPP, “Technical Specification Group Services and System Aspects, ” UMTS Access Stratum,” 3GPP TS 23.101 V4.0.0 (2001-04), 2001.
 D.Gay, P. Levis, R. von Behren, M. Welsh, E. Brewer, and D. Culler. The nesc language: A holistic approach to networked embedded systems. In Programming Languages Design and Implementation, 2003.
 J.Hill, R. Szewczyk, A. Woo, S. Hollar, D. Culler, and K. Pister. System architecture directions for network sensors. In Architectural Support for Programming Languages and Operating System, 2000.
 A. Nasipuri and K. Li. A directionality based location discovery scheme for wireless sensor networks. In 1st ACM Int’l Workshop on Wireless Sensor Networks and Applications (WSNA’02), pages 105-111, Atlanta, GA, Sept. 2002.
 A. Savvides, C.C. Han, and M.Srivastava. Dynamic finegrained localization in ad hoc networks of sensors. In ACM/IEEE Int’l Conf. on Mobile Computing and Networking (MOBICON),July 2001.
 Stargate, http://www.xbow.com/Products/productsdetails.aspx?sid=85, Feb. 2004
 Self-propelled-Car,http://www.icci.com.tw/book66/_file/2307/cache/web/cly/mdAllListnullCA00000023070000703_zh_TW.html?&c_id=CA0000002307000070,July. 2005.