@inproceedings{PODS-1984-KuperUV,
	author        = "Gabriel M. Kuper and Jeffrey D. Ullman and Moshe Y. Vardi",
	booktitle     = "{Proceedings of the Third Symposium on Principles of Database Systems}",
	cdrom         = "['journals/anthology/cd1-3:PODS84/P221.PDF', 'journals/anthology/dvd1:text/1-3/PODS84/P221.PDF']",
	doi           = "10.1145/588011.588044",
	isbn          = "0-89791-128-8",
	pages         = "221--228",
	publisher     = "{ACM}",
	title         = "{On the Equivalence of Logical Databases}",
	year          = 1984,
}