Refinement of Document Clustering by Using NMF Hiroyuki Shinnou author Minoru Sasaki author 2007-11 text Proceedings of the 21st Pacific Asia Conference on Language, Information and Computation The Korean Society for Language and Information (KSLI) Seoul National University, Seoul, Korea conference publication shinnou-sasaki-2007-refinement http://hdl.handle.net/2065/29144 https://aclanthology.org/Y07-1045/ 2007-11 430 439