Haiyang Ding Daniel Benevides da Costa Himal A. Suraweera Jianhua Ge Role Selection for Energy Harvesting Cooperative Systems. 1-6 2015 GLOBECOM https://doi.org/10.1109/GLOCOM.2014.7417289 conf/globecom/2015 db/conf/globecom/globecom2015.html#DingCSG15