@INPROCEEDINGS{Zha_03,
  AUTHOR = {J. Zhao and R. Govindan and D. Estrin},
  TITLE = {Computing Aggregates for Monitoring Wireless Sensor Networks},
  BOOKTITLE = {Proceedings of the First IEEE International Workshop on Sensor Network Protocols and Applications},
  YEAR = {2003},
  MONTH = {May},
  PAGES = {139-148},
  URL       = {http://enl.usc.edu/papers/cache/Zhao02.pdf},
  ADDRESS = {}
}