@inproceedings{ko-seo-2000-automatic,
    title = "Automatic Text Categorization by Unsupervised Learning",
    author = "Ko, Youngjoong  and
      Seo, Jungyun",
    booktitle = "{COLING} 2000 Volume 1: The 18th International Conference on Computational Linguistics",
    year = "2000",
    url = "https://preview.aclanthology.org/fix-sig-urls/C00-1066/"
}