@inproceedings{CIAA-2001-DangBIK,
	author        = "Zhe Dang and Tevfik Bultan and Oscar H. Ibarra and Richard A. Kemmerer",
	booktitle     = "{Revised Papers of the Sixth International Conference on Implementation and Application of Automata}",
	doi           = "10.1007/3-540-36390-4_7",
	isbn          = "3-540-00400-9",
	pages         = "74--86",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Past Pushdown Timed Automata}",
	volume        = 2494,
	year          = 2001,
}