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http://www.ipass.com/wifi-growth-map/
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2. Calhoun, P., et al. (2009). Configuration and provisioning for wireless access points (CAPWAP) protocol specification. In IETF, RFC 5415.
3. Calhoun, P., et al. (2010). Light weight access point protocol. In IETF, RFC 5412.
4. IEEE Std. (2008). Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications. Amendment 1: Radio resource measurement of wireless LANs. In 802.11k-2008.
5. Bansal, M., Mehlman, J., Katti, S., & Levis, P. (2012). Openradio: A programmable wireless dataplane. In HotSDN.