We present the Priority R-tree, or PR-tree, which is the first R-tree variant that always answers a window query using O((N/B)1-1/d+T/B) I/Os, where N is the number of d-dimensional (hyper-) rectangles stored in the R-tree, B is the disk block size, and T
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K. Williams, A. Noll, A. Gal, and D. Gregg. CF '08: Proceedings of the 2008 conference on Computing frontiers, page 189--198. New York, NY, USA, ACM, (2008)
L. Hernandez, C. Martinez-Garcia, and F. Brown. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)