@inproceedings{SAS-2002-NielsonNS,
	author        = "Flemming Nielson and Hanne Riis Nielson and Helmut Seidl",
	booktitle     = "{Proceedings of the Ninth International Static Analysis Symposium}",
	doi           = "10.1007/3-540-45789-5_5",
	isbn          = "3-540-44235-9",
	pages         = "20--35",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Normalizable Horn Clauses, Strongly Recognizable Relations, and Spi}",
	volume        = 2477,
	year          = 2002,
}