@inproceedings{VMCAI-2004-BagnaraHZ,
	author        = "Roberto Bagnara and Patricia M. Hill and Enea Zaffanella",
	booktitle     = "{Proceedings of the Fifth International Conference on Verification, Model Checking and Abstract Interpretation}",
	doi           = "10.1007/978-3-540-24622-0_13",
	isbn          = "3-540-20803-8",
	pages         = "135--148",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Widening Operators for Powerset Domains}",
	volume        = 2937,
	year          = 2004,
}