1. Federal Communications Commission: ‘Cognitive Radio Technologies Proceeding (CRTP)’, available at: http://www.fcc.gov/oet/cognitiveradio/
2. Mitola, J.: ‘Cognitive radio: an integrated agent architecture for software defined radio’, (Doctor of Technology, Royal Inst. Technol. (KTH), Stockholm, Sweden 2000)
3. Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency