@article{Ullman/Zaniolo:91,
	title = {Deductive {Databases}: {Achievements} and {Future} {Directions}},
	volume = {19},
	journal = {SIGMOD Record},
	author = {Ullman, J D and Zaniolo, C},
	year = {1991},
	note = {Series Number: 4},
	pages = {75--82},
}

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