@book{26210,
	author = {Huxhold, William E.},
	title = {An introduction to urban geographic information systems /},
	publisher = {Oxford University Press,},
	year = {1991.},
	series = {Spatial information systems},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy0604/90007095-d.html}
}