@article {Williams:1987:1523-0406:176,
	author = "Williams, Robert",
	title = "Communications From Readers",
	journal = "Cartography and Geographic Information Science",
	volume = "14",
	number = "2",
	year = "1987",
	abstract = "",
	pages = "176-176",
	url = "http://www.ingentaconnect.com/content/cagis/cagis/1987/00000014/00000002/art00007",
	doi = "doi:10.1559/152304087783875237"
}