Information Classification and Navigation based on 5W1H of the Target Information Takahiro Ikeda author Akitoshi Okumura author Kazunori Muraki author 1998-08 text 36th Annual Meeting of the Association for Computational Linguistics and 17th International Conference on Computational Linguistics, Volume 1 Association for Computational Linguistics Montreal, Quebec, Canada conference publication ikeda-etal-1998-information-classification 10.3115/980845.980940 https://aclanthology.org/P98-1093/ 1998-08 571 577