@article{Kuich200169,
    Author = {Kuich, Werner},
    File = {Pushdown Tree Automata, Algebraic Tree Systems, and Algebraic Tree Series - Kuich (0) (0) - a - a - w.pdf},
    ISSN = {0890-5401},
    Journal = {Information and Computation},
    Keywords = {tree-pushdown automata and formal power series},
    Number = {1},
    Pages = {69 - 99},
    Title = {Pushdown Tree Automata, Algebraic Tree Systems, and Algebraic Tree Series},
    URL = {http://www.sciencedirect.com/science/article/pii/S0890540100929080},
    Volume = {165},
    Year = {2001},
    bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0890540100929080},
    bdsk-url-2 = {http://dx.doi.org/10.1006/inco.2000.2908},
    date-added = {2012-10-16 12:51:13 +0000},
    date-modified = {2012-10-26 08:32:59 +0000},
    doi = {10.1006/inco.2000.2908}
}

@article{Kuich200169, Author = {Kuich, Werner}, File = {Pushdown Tree Automata, Algebraic Tree Systems, and Algebraic Tree Series - Kuich (0) (0) - a - a - w.pdf}, ISSN = {0890-5401}, Journal = {Information and Computation}, Keywords = {tree-pushdown automata and formal power series}, Number = {1}, Pages = {69 - 99}, Title = {Pushdown Tree Automata, Algebraic Tree Systems, and Algebraic Tree Series}, URL = {http://www.sciencedirect.com/science/article/pii/S0890540100929080}, Volume = {165}, Year = {2001}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0890540100929080}, bdsk-url-2 = {http://dx.doi.org/10.1006/inco.2000.2908}, date-added = {2012-10-16 12:51:13 +0000}, date-modified = {2012-10-26 08:32:59 +0000}, doi = {10.1006/inco.2000.2908} }