@inproceedings{CSL-1987-Volger,
	author        = "Hugo Volger",
	booktitle     = "{Proceedings of the First Workshop on Computer Science Logic}",
	doi           = "10.1007/3-540-50241-6_47",
	isbn          = "3-540-50241-6",
	pages         = "322--334",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Model Theory of Deductive Databases}",
	volume        = 329,
	year          = 1987,
}