@inproceedings{shinnou-sasaki-2007-refinement,
    title = "Refinement of Document Clustering by Using {NMF}",
    author = "Shinnou, Hiroyuki  and
      Sasaki, Minoru",
    booktitle = "Proceedings of the 21st Pacific Asia Conference on Language, Information and Computation",
    month = nov,
    year = "2007",
    address = "Seoul National University, Seoul, Korea",
    publisher = "The Korean Society for Language and Information (KSLI)",
    url = "https://aclanthology.org/Y07-1045/",
    doi = "http://hdl.handle.net/2065/29144",
    pages = "430--439"
}