@inproceedings{PODS-1987-BeeriNRST,
	author        = "Catriel Beeri and Shamim A. Naqvi and Raghu Ramakrishnan and Oded Shmueli and Shalom Tsur",
	booktitle     = "{Proceedings of the Sixth Symposium on Principles of Database Systems}",
	cdrom         = "['journals/anthology/cd1-3:PODS87/P021.PDF', 'journals/anthology/dvd1:text/1-3/PODS87/P021.PDF']",
	doi           = "10.1145/28659.28662",
	isbn          = "0-89791-223-3",
	pages         = "21--37",
	publisher     = "{ACM}",
	title         = "{Sets and Negation in a Logic Database Language (LDL1)}",
	year          = 1987,
}