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Wireless sensor networks are tightly associated with the underlying environment in which the sensors are deployed. The global topology of the network is of great importance to both sensor network applications and the implementation of networking functionalities. In this paper we study the problem of topology discovery, in particular, identifying boundaries in a sensor network. Suppose a large number of sensor nodes are scattered in a geometric region, with nearby nodes communicating with eachdoi:10.1145/1161089.1161104 dblp:conf/mobicom/WangGM06 fatcat:zwa33hbnhbgrhjawkkw7chm7xq