@inproceedings{SIGMOD-1984-ShepherdK,
	author        = "Allan Shepherd and Larry Kerschberg",
	booktitle     = "{Proceedings of the 14th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD84/P307.PDF",
	doi           = "10.1145/602259.602299",
	pages         = "307--315",
	publisher     = "{ACM Press}",
	title         = "{PRISM: A Knowledge Based System for Semantic Integrity Specification and Enforcement in Database Systems}",
	year          = 1984,
}