1. Ntia, U.S. frequency allocations. http://www.ntia.doc.gov/osmhome/allochrt.pdf .
2. Spectrum policy task force report. (2002, November). Federal communications commission, Tech. Rep. 02-155.
3. Mitola, J. III. & Maguire, G. Q. Jr. (1999). Cognitive radio: Making software radios more personal. IEEE Personal Communications, 6, 13–18.
4. Mitola, J., III. (2000, May 8). Cognitive radio: An integrated agent architecture for software defined radio, Ph. D. diss., Royal Institute of Technology, Sweden.
5. Haykin, S. (2005). Cognitive radio: Brain-empowered wireless communications. IEEE Journal on Selected Areas in Communications, 23(2), 201–220.