Opinion Holder and Target Extraction based on the Induction of Verbal Categories Michael Wiegand author Josef Ruppenhofer author 2015-07 text Proceedings of the Nineteenth Conference on Computational Natural Language Learning Association for Computational Linguistics Beijing, China conference publication wiegand-ruppenhofer-2015-opinion 10.18653/v1/K15-1022 https://aclanthology.org/K15-1022/ 2015-07 215 225