@inproceedings{ristad-thomas-1997-hierarchical,
    title = "Hierarchical Non-Emitting {M}arkov Models",
    author = "Ristad, Eric Sven  and
      Thomas, Robert G.",
    booktitle = "35th Annual Meeting of the Association for Computational Linguistics and 8th Conference of the {E}uropean Chapter of the Association for Computational Linguistics",
    month = jul,
    year = "1997",
    address = "Madrid, Spain",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/P97-1049/",
    doi = "10.3115/976909.979666",
    pages = "381--385"
}