@InProceedings{lazos2006coverage,
  title="Coverage in heterogeneous sensor networks",
  author="Lazos, L. and Poovendran, R.",
  booktitle="Proceedings of the 4th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks ({WiOpt})",
  pages="1-10",
  year="2006"
}