@inproceedings {4435,
	title = {An Extensible Index for Spatial Databases},
	booktitle = {International Conference on Statistical and Scientific Database Management (SSDBM)},
	year = {2001},
	doi = {10.1109/SSDM.2001.938537},
	author = {Walid G. Aref and Ihab Ilyas}
}
