@article {520,
	title = {Two approaches to developing expert systems: A consideration of formal and semi-formal domains},
	journal = {AI \& Society},
	volume = {5},
	number = {2},
	year = {1991},
	pages = {110-127},
	isbn = {0951{\textendash}5666},
	url = {AISociety1991.pdf},
	author = {Edgar A. Whitley}
}
