@article {:1988:1523-0406:21,
	title = "Definitions and References",
	journal = "Cartography and Geographic Information Science",
	volume = "15",
	number = "1",
	year = "1988",
	abstract = "",
	pages = "21-31",
	url = "http://www.ingentaconnect.com/content/cagis/cagis/1988/00000015/00000001/art00003",
	doi = "doi:10.1559/152304088783887134"
}