@inproceedings{VLDB-1993-KemperMP,
	author        = "Alfons Kemper and Guido Moerkotte and Klaus Peithner",
	booktitle     = "{Proceedings of the 19th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1993/P543.PDF",
	isbn          = "1-55860-152-X",
	pages         = "543--554",
	publisher     = "{Morgan Kaufmann}",
	title         = "{A Blackboard Architecture for Query Optimization in Object Bases}",
	year          = 1993,
}