@ARTICLE{ChengTON, 
author={Cheng, W. and Zhang, N. and Cheng, X. and Song, M. and Chen, D.}, 
journal={Networking, IEEE/ACM Transactions on}, title={Time-Bounded Essential Localization for Wireless Sensor Networks}, 
year={2013}, 
month={apr.}, 
volume={21}, 
number={2}, 
pages={400-412}, 
}