Propositional Term Extraction over Short Text using Word Cohesiveness and Conditional Random Fields with Multi-Level Features Ru-Yng Chang author Chung-Hsien Wu author 2008-09 text Proceedings of the 20th Conference on Computational Linguistics and Speech Processing Chao-Lin Liu editor Berlin Chen editor The Association for Computational Linguistics and Chinese Language Processing (ACLCLP) Taipei, Taiwan conference publication chang-wu-2008-propositional https://aclanthology.org/O08-1011/ 2008-09 151 165