@inproceedings{kondo-etal-2013-hidden,
    title = "Hidden {M}arkov Tree Model for Word Alignment",
    author = "Kondo, Shuhei  and
      Duh, Kevin  and
      Matsumoto, Yuji",
    editor = "Bojar, Ondrej  and
      Buck, Christian  and
      Callison-Burch, Chris  and
      Haddow, Barry  and
      Koehn, Philipp  and
      Monz, Christof  and
      Post, Matt  and
      Saint-Amand, Herve  and
      Soricut, Radu  and
      Specia, Lucia",
    booktitle = "Proceedings of the Eighth Workshop on Statistical Machine Translation",
    month = aug,
    year = "2013",
    address = "Sofia, Bulgaria",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-emnlp/W13-2263/",
    pages = "503--511"
}