1. IEEE 802.11a WG, Part 11 (1999). Wireless LAN medium access control (MAC) and physical layer (PHY) specification: High-speed physical layer in the 5 GHz Band.
2. IEEE 802.11b WG, Part 11 (1999). Wireless LAN medium access control (MAC) and physical layer (PHY) specification: High-speed physical layer extension in the 2.4 GHz Band, IEEE.
3. IEEE Std 802.11g/D1.1, Part11 (2001). 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. Telecoms. com, August 20, 2009 http://www.telecoms.com/13962/bt-lights-up-half-a-million-wifi-hotspots