Classification of Open-Ended Questionnaire Texts based on Surface Expressions. 論文 Inui Hiroko・Masaki Murata・Kiyotaka Uchimoto・Hitoshi Isahara ·2003-01-01 ·『Journal of Natural Language Processing』 10(2) pp. 19-42 doi:10.5715/jnlp.10.2_19