@article {:1991:1523-0406:78,
	title = "Cartographic Notes",
	journal = "Cartography and Geographic Information Science",
	volume = "18",
	number = "1",
	year = "1991",
	abstract = "",
	pages = "78-78",
	url = "http://www.ingentaconnect.com/content/cagis/cagis/1991/00000018/00000001/art00007",
	doi = "doi:10.1559/152304091783805608"
}