E. Z. Tragos, S. Zeadally, A.G. Fragkiadakis, V. A. Siris, "Spectrum Assignment in Cognitive Radio Networks: A Comprehen

E. Z. Tragos, S. Zeadally, A.G. Fragkiadakis, V. A. Siris, "Spectrum Assignment in Cognitive Radio Networks: A Comprehensive Survey", IEEE Communications Surveys & Tutorials, 2013