1. H. Samet. The Design and Analysis of Spatial Data Structures. Addison Wesley, Reading MA, 1990 . (bibtex entry)

1. G.R. Hjaltason and H. Samet. Speeding up construction of PMR quadtree-based spatial indexes. VLDB Journal, 11(2):110--137 , 2002. (bibtex entry)

2. F. Brabec and H. Samet. Visual Database Systems 4 (VDB4), chapter Visualizing and animating r-trees and spatial operations in spatial databases on the worldwide web, pages 147--153. Chapman & Hall, 1998. (http://www.cs.umd.edu/~hjs/pubs.html ) (bibtex entry)

3. W. G. Aref and H. Samet. Efficient window block retrieval in quadtree-based spatial databases. GeoInformatica, 1(1):59--91, April 1997. (http://www.cs.umd.edu/~hjs/pubs.html ) (bibtex entry)

4. H. Samet and W. G. Aref. Modern Database Systems: The Object Model, Interoperability, and Beyond, chapter Spatial data models and query processing, pages 338--360. Addison-Wesley/ACM Press, 1995. (http://www.cs.umd.edu/~hjs/pubs.html ) (bibtex entry)

5. C.A. Shaffer, H. Samet, and R.C. Nelson. QUILT: a geographic information systems based on quad-trees. Int. J. Geographical Information Systems, 4(2):103--131 , 1990. (bibtex entry)

6. H. Samet. Hierarchical representations of collections of small rectangles. ACM Computing Surveys (CSUR), 20(4):271--309, Dec. 1988. (bibtex entry)

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

1. F. Brabec and H. Samet. Spatial Index Demos. Retrieved February 06, 2006 - http://www.cs.umd.edu/$\sim$brabec/quadtree/. (http://www.cs.umd.edu/~brabec/quadtree/ ) (bibtex entry)

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