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"QUILT: a geographic information system based on quadtrees."
Clifford A. Shaffer, Hanan Samet, Randal C. Nelson (1990)
- Clifford A. Shaffer, Hanan Samet, Randal C. Nelson:
QUILT: a geographic information system based on quadtrees. Int. J. Geogr. Inf. Sci. 4(2): 103-131 (1990)

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