@ARTICLE{7559728, author={Yuan, Xu and Tian, Feng and Hou, Y. Thomas and Lou, Wenjing and Sherali, Hanif D. and Kompella, Sastry and Reed, Jeffrey H.}, journal={IEEE Journal on Selected Areas in Communications}, title={On Throughput Region for Primary and Secondary Networks With Node-Level Cooperation}, year={2016}, volume={34}, number={10}, pages={2763-2775}, doi={10.1109/JSAC.2016.2606018}}