@article { DoNR02,
	title = {Description Logics of Minimal Knowledge and Negation as Failure},
	journal = {TOCL},
	volume = {3},
	number = {2},
	year = {2002},
	pages = {1{\textendash}49},
	author = {Francesco M. Donini and D. Nardi and Riccardo Rosati}
}
@article {DoNR02,
	title = {Description Logics of Minimal Knowledge and Negation as Failure},
	volume = {3},
	number = {2},
	year = {2002},
	pages = {1{\textendash}49},
	author = {Francesco M. Donini and Daniele Nardi and Riccardo Rosati}
}
@article { DoNR02,
	title = {Description Logics of Minimal Knowledge and Negation as Failure},
	volume = {3},
	number = {2},
	year = {2002},
	pages = {1{\textendash}49},
	author = {Francesco M. Donini and D. Nardi and Riccardo Rosati}
}
