@article {15517,
	title = {Logic and databases: a 20 year retrospective-updated in honor of Ray Reiter},
	journal = {Logical Foundations for Cognitive Agents: Contributions in Honor of Ray Reiter},
	year = {1999},
	month = {1999///},
	pages = {234 - 299},
	author = {Minker, Jack}
}
