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Given a data point set D, a query point set Q and an integer k, the group nearest group (GNG) query finds a subset of points from D, omega (|omega| les k), such that the total distance from all points in Q to the nearest point in omega is no greater than any other subset of points in D, omega(|omega| les k). GNG query can be found in many real applications. In this paper, exhaustive hierarchical combination...
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