@ARTICLE{6153401, author={Xie, Liguang and Shi, Yi and Hou, Y. Thomas and Sherali, Hanif D.}, journal={IEEE/ACM Transactions on Networking}, title={Making Sensor Networks Immortal: An Energy-Renewal Approach With Wireless Power Transfer}, year={2012}, volume={20}, number={6}, pages={1748-1761}, doi={10.1109/TNET.2012.2185831}}