7Przemys~aw Pawe~czak, Venkatesha Prasad R, Liang Xia, et al. Cognitive radio emergency networks-requirements and design. In: IEEE DYSPAN, Baltimore, USA, Nov 2005
8McHenry M A. NSF spectrum occupancy measurements project summary, http://www.sharedspectrum.com/?section =measurements, 2005
9Federal Communications Commission. Facilitating opportunities for flexible, efficient, and reliable spectrum use employing cognitive radio technologies. FCC Document ET Docket No 03- 108, 2003, 12
10Danijela E, Shridhar M M, Daniel W, et al. A cognitive radio approach for usage of virtual unlicensed spectrum. In: 14th IST Mobile Wireless Communication Summit, Germany, June 2005
