@article{
    BealCKP08,
    author = "B{\'e}al, Marie-Pierre and Czeizler, Eugen and Kari, Jarkko and Perrin, Dominique",
    title = "Unambiguous Automata",
    url = "http://dx.doi.org/10.1007/s11786-007-0027-1",
    journal = "Mathematics in Computer Science",
    number = "4",
    volume = "1",
    flags = "copy",
    year = "2008",
    pages = "625-638"
}