@inproceedings{SEFM-2008-Cortesi,
	author        = "Agostino Cortesi",
	booktitle     = "{Proceedings of the Sixth IEEE International Conference on Software Engineering and Formal Methods}",
	doi           = "10.1109/SEFM.2008.20",
	isbn          = "978-0-7695-3437-4",
	pages         = "31--40",
	publisher     = "{IEEE Computer Society}",
	title         = "{Widening Operators for Abstract Interpretation}",
	year          = 2008,
}