Christian Doerr Douglas C. Sicker Dirk Grunwald Dynamic Control Channel Assignment in Cognitive Radio Networks Using Swarm Intelligence. 4866-4871 2008 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2008.ECP.932 conf/globecom/2008 db/conf/globecom/globecom2008.html#DoerrSG08