Wael Jaafar Wessam Ajib David Haccoun A Novel Relay-Aided Transmission Scheme in Cognitive Radio Networks. 1-6 2011 GLOBECOM https://doi.org/10.1109/GLOCOM.2011.6133927 conf/globecom/2011 db/conf/globecom/globecom2011.html#JaafarAH11