1. Wu, T. Bandwidth is the new black gold—10 ideas for the next 10 years. http://www.time.com/time/specials/packages/article/0,28804,1971133_1971110_1971125,00.html .
2. Mitola, J. (2000). Cognitive radio: An integrated agent architecture for software defined radio. Dissertation, Royal Institute Technology (KTH) Stockholm, Sweden.
3. Haykin, S. (2005). Cognitive radio: Brain-empowered wireless communications. IEEE Journal on Selected Areas in Communication, 23(2), 201–220.
4. Yucek, T., & Arslan, H. A. (2009). Survey of spectrum sensing algorithms for cognitive radio applications. IEEE Communications Survey and Tutorials, 11(1), 116–130.
5. Bixio, L., Ottonello, M., Raffetto, M., & Regazzoni, C. S. (2011). Comparison and cognitive radio architectures for spectrum sensing. EURASIP Journal on Wireless Communications and Networking, 2011, Article ID 749891, 18. doi: 10.1155/2011/759891 .