@inproceedings{CSL-2012-Parys,
	author        = "Pawel Parys",
	booktitle     = "{Proceedings of the 21st EACSL Annual Conference / 26th International Workshop on Computer Science Logic}",
	doi           = "10.4230/LIPIcs.CSL.2012.500",
	isbn          = "978-3-939897-42-2",
	pages         = "500--515",
	publisher     = "{Schloss Dagstuhl — Leibniz-Zentrum für Informatik}",
	series        = "{Leibniz International Proceedings in Informatics}",
	title         = "{Variants of Collapsible Pushdown Systems}",
	volume        = 16,
	year          = 2012,
}