Document Classification Using Domain Specific Kanji Characters Extracted by X2 Method Yasuhiko Watanabe author Masaki Murata author Masahito Takeuchi author Makoto Nagao author 1996 text COLING 1996 Volume 2: The 16th International Conference on Computational Linguistics conference publication watanabe-etal-1996-document https://aclanthology.org/C96-2134/ 1996