@inproceedings{yamamoto-etal-2001-multi,
    title = "Multi-Class Composite N-gram Language Model for Spoken Language Processing Using Multiple Word Clusters",
    author = "Yamamoto, Hirofumi  and
      Isogai, Shuntaro  and
      Sagisaka, Yoshinori",
    booktitle = "Proceedings of the 39th Annual Meeting of the Association for Computational Linguistics",
    month = jul,
    year = "2001",
    address = "Toulouse, France",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/P01-1068/",
    doi = "10.3115/1073012.1073080",
    pages = "531--538"
}