@article{ChengTON13,
  author = {Wei Cheng and Nan Zhang and Xiuzhen Cheng and Min Song and  Dechang Chen},
  title = {Time-Bounded Essential Localization for Wireless Sensor Networks},
  journal = {IEEE/ACM Transactions on Networking},
  volume = {21},
  number = {2},
  pages = {400-412},
  month = {April},
  year = {2013},
}