@inproceedings{STOC-1999-AmanoI,
	author        = "Masami Amano and Kazuo Iwama",
	booktitle     = "{Proceedings of the 31st Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/301250.301344",
	isbn          = "1-58113-067-8",
	pages         = "368--375",
	publisher     = "{ACM}",
	title         = "{Undecidability on Quantum Finite Automata}",
	year          = 1999,
}