@inproceedings{PODS-1985-Vardi,
	author        = "Moshe Y. Vardi",
	booktitle     = "{Proceedings of the Fourth Symposium on Principles of Database Systems}",
	cdrom         = "['journals/anthology/cd1-3:PODS85/P057.PDF', 'journals/anthology/dvd1:text/1-3/PODS85/P057.PDF']",
	doi           = "10.1145/325405.325413",
	isbn          = "0-89791-153-9",
	pages         = "57--65",
	publisher     = "{ACM}",
	title         = "{Querying Logical Databases}",
	year          = 1985,
}