1. FCC Spectrum Policy Task Force, Report of the spectrum efficiency work group, Tech. Rep., November, 2002.
2. Mitola, J. (2009). Cognitive radio architecture evolution. Proceedings of the IEEE, 97(4), 626–641.
3. Mitola, J., & Maguire, G. Q. (1999). Cognitive radio: Making software radios more personal. IEEE Personal Communications, 6(4), 13–18.
4. Federal communications commission (fcc) 08-260: Second report and order and memorandum opinion and order in et docket nos. -2-380 (additional spectrum for unilicensed devices below 900 mhz and in the 3 ghz band) and 04-186 (unlicensed operation in the tv broadcast bands), Nov. 14, 2008.
5. IEEE 802.22 Working Group. http://www.ieee802.org/22/ .