@article{journals/ai/Etherington87,
	title = {Formalizing Nonmonotonic Reasoning Systems.},
	author = {David W. Etherington},
	journal = {Artif. Intell.},
	number = {1},
	pages = {41-85},
	url = {http://dblp.uni-trier.de/db/journals/ai/ai31.html#Etherington87},
	volume = {31},
	year = {1987},
	biburl = {http://www.bibsonomy.org/bibtex/23e83437b86e31b524d136ac05b1311a4/dblp},
	description = {dblp},
	date = {2003-11-19},
	keywords = {dblp }
}