Chetan Nanjunda Mathur Mohamed A. Haleem Rajarathnam Chandramouli K. P. Subbalakshmi Impact of Constraints on the Complexity of Dynamic Spectrum Assignment. 3164-3169 2008 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2008.ECP.607 conf/globecom/2008 db/conf/globecom/globecom2008.html#MathurHCS08