@inproceedings{napskar04b,
  author = {Jouni Karvo and Henri Koskinen},
  title = {Connecting Clusters in Sensor Networks},
  booktitle = {Proceedings of 17th Nordic Teletraffic Seminar (NTS-17)},
  pages = {409--416},
  month = {Aug.},
  year = {2004},
}