@inproceedings{SIGMOD-1993-Egenhofer,
	author        = "Max J. Egenhofer",
	booktitle     = "{Proceedings of the 23rd ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD93/P398.PDF",
	doi           = "10.1145/170035.170096",
	pages         = "398--402",
	publisher     = "{ACM Press}",
	title         = "{What’s Special about Spatial? Database Requirements for Vehicle Navigation in Geographic Space}",
	year          = 1993,
}