@inproceedings{CASE-2012-KobayashiH,
	author        = "Koichi Kobayashi and Kunihiko Hiraishi",
	booktitle     = "{Proceedings of the Eighth International Conference on Automation Science and Engineering}",
	doi           = "10.1109/CoASE.2012.6386310",
	isbn          = "978-1-4673-0429-0",
	pages         = "662--667",
	publisher     = "{IEEE}",
	title         = "{On opacity and diagnosability in discrete event systems modeled by pushdown automata}",
	year          = 2012,
}