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Given a positive value r, a distance based range query returns the objects that lie within the distance r of the query location. In this paper, we focus on the distance based range queries that continuously change their locations in a Euclidean space. We present an efficient and effective monitoring technique based on the concept of a safe zone. The safe zone of a query is the area with a property that while the query remains inside it, the results of the query remain unchanged. Hence, thedoi:10.1109/tkde.2010.246 fatcat:wukycpn24ngidgctueto637v2q