Keyword-based Document Clustering Seung-Shik Kang author 2003-07 text Proceedings of the Sixth International Workshop on Information Retrieval with Asian Languages Association for Computational Linguistics Sapporo, Japan conference publication kang-2003-keyword 10.3115/1118935.1118952 https://aclanthology.org/W03-1117/ 2003-07 132 137