@inproceedings{dalessio-etal-1998-category,
    title = "Category Levels in Hierarchical Text Categorization",
    author = "D{'}Alessio, Stephen  and
      Murray, Keitha  and
      Schiaffino, Robert  and
      Kershenbaum, Aaron",
    editor = "Ide, Nancy  and
      Voutilainen, Atro",
    booktitle = "Proceedings of the Third Conference on Empirical Methods for Natural Language Processing",
    month = jun,
    year = "1998",
    address = "Palacio de Exposiciones y Congresos, Granada, Spain",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/W98-1508/",
    pages = "61--70"
}