@inproceedings{VLDB-1992-KramerLS,
	author        = "Michael Kramer and Georg Lausen and Gunter Saake",
	booktitle     = "{Proceedings of the 18th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1992/P251.PDF",
	isbn          = "1-55860-151-1",
	pages         = "251--262",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Updates in a Rule-Based Language for Objects}",
	year          = 1992,
}