@inproceedings{VLDB-1993-Grefen,
	author        = "Paul W. P. J. Grefen",
	booktitle     = "{Proceedings of the 19th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1993/P581.PDF",
	isbn          = "1-55860-152-X",
	pages         = "581--591",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Combining Theory and Practice in Integrity Control: A Declarative Approach to the Specification of a Transaction Modification Subsystem}",
	year          = 1993,
}