@inproceedings{VLDB-1975-HammerM,
	author        = "Michael Hammer and Dennis McLeod",
	booktitle     = "{Proceedings of the First International Conference on Very Large Data Bases}",
	cdrom         = "VLDB75/P025.PDF",
	doi           = "10.1145/1282480.1282483",
	pages         = "25--47",
	publisher     = "{ACM}",
	title         = "{Semantic Integrity in a Relational Data Base System}",
	year          = 1975,
}