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2. IEEE 802.11b W. G. (1999). Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specification: High-speed Physical Layer Extension in the 2.4 GHz Band, IEEE, Sep. 1999.
3. IEEE Std 802.11g/D1.1 (2001). Part11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band.
4. Wi-Fi technical details. http://www.btopenzone.com/help/technical-details/index.jsp .
5. BT lights up half a million wifi hotspots (2009). Telecoms.com, August 20, http://www.telecoms.com/13962/bt-lights-up-half-a-million-wifi-hotspots