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Haykin, S., 2005. Cognitive radio: Brain-empowered wireless communications. IEEE J. Sel. Areas Commun., 23: 201-220.
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Kone, V., L. Yang, X. Yang, B.Y. Zhao and H. Zheng, 2012. The effectiveness of opportunistic spectrum access: A measurement study. IEEE./ACM. Trans. Networking, 20: 2005-2016.
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Lopez, R.B. and M.S. Sanchez, 2015. La radio cognitiva y su impacto en el uso eficiente del espectro de radio. Ingenieriia Electron. Autom. Comunicaciones, 36: 42-55.

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Zhao, Q. and A. Swami, 2007. A survey of dynamic spectrum access: Signal processing and networking perspectives. Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Volume 4, April 15-20, 2007, Honolulu, HI., USA., pp: IV-1349-IV-1352.