@inproceedings{yamamoto-etal-2004-hierarchy,
    title = "Hierarchy Extraction based on Inclusion of Appearance",
    author = "Yamamoto, Eiko  and
      Kanzaki, Kyoko  and
      Isahara, Hitoshi",
    booktitle = "Proceedings of the {ACL} Interactive Poster and Demonstration Sessions",
    month = jul,
    year = "2004",
    address = "Barcelona, Spain",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/P04-3015/",
    pages = "150--153"
}