1. 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)

2. 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)

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