@article{allauzen-etal-2014-pushdown,
    title = "Pushdown Automata in Statistical Machine Translation",
    author = "Allauzen, Cyril  and
      Byrne, Bill  and
      de Gispert, Adri{\`a}  and
      Iglesias, Gonzalo  and
      Riley, Michael",
    journal = "Computational Linguistics",
    volume = "40",
    number = "3",
    month = sep,
    year = "2014",
    address = "Cambridge, MA",
    publisher = "MIT Press",
    url = "https://aclanthology.org/J14-3008/",
    doi = "10.1162/COLI_a_00197",
    pages = "687--723"
}