Wei Feng Jiannong Cao Chisheng Zhang Chuda Liu Joint Optimization of Spectrum Handoff Scheduling and Routing in Multi-hop Multi-radio Cognitive Networks. 85-92 2009 ICDCS http://dx.doi.org/10.1109/ICDCS.2009.64 conf/icdcs/2009 db/conf/icdcs/icdcs2009.html#FengCZL09