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Lately, wireless sensor networks are garnering a lot of interests, as it is feasible to deploy them in many ad hoc scenarios such as for earthquake monitoring, tsunami monitoring and battlefield surveillance. As sensor nodes may be deployed in hostile areas, these batterypowered nodes are mostly expected to operate for a relatively long period. Clustering is an approach actively pursued by many groups in realizing more scalable data gathering and routing. However, it is rather challenging todoi:10.1016/j.comcom.2007.05.010 fatcat:2efqdkvasratfeapcifuvnrfry