@inproceedings{CSL-1993-Marcinkowski,
	author        = "Jerzy Marcinkowski",
	booktitle     = "{Selected Papers of the Seventh Workshop on Computer Science Logic}",
	doi           = "10.1007/BFb0049334",
	isbn          = "3-540-58277-0",
	pages         = "223--237",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{A Horn Clause that Implies and Undecidable Set of Horn Clauses}",
	volume        = 832,
	year          = 1993,
}