@ARTICLE{5648397, author={Sharma, Sushant and Shi, Yi and Hou, Y. Thomas and Kompella, Sastry}, journal={IEEE/ACM Transactions on Networking}, title={An Optimal Algorithm for Relay Node Assignment in Cooperative Ad Hoc Networks}, year={2011}, volume={19}, number={3}, pages={879-892}, doi={10.1109/TNET.2010.2091148}}