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2. H. Samet. The Quadtree and Related Hierarchical Structures. ACM Computing Surveys, 16(2 ):187--260, 1984. (bibtex entry)

1. A. Guttman. R-trees : A Dynamic Index Structure for Spatial Searching. In Proc. of ACM SIGMOD Int. Conf. on the Management of Data - SIGMOD Record 14(2), pages 45--57, 1984 . (bibtex entry)

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