C. Hsin, and M. Liu. IPSN '04: Proceedings of the 3rd international symposium on Information processing in sensor networks, page 433--442. New York, NY, USA, ACM, (2004)
R. Ghrist, and A. Muhammad. IPSN '05: Proceedings of the 4th international symposium on Information processing in sensor networks, Piscataway, NJ, USA, IEEE Press, (2005)