Opinion Holder and Target Extraction for Verb-based Opinion Predicates – The Problem is Not Solved Michael Wiegand author Marc Schulder author Josef Ruppenhofer author 2015-09 text Proceedings of the 6th Workshop on Computational Approaches to Subjectivity, Sentiment and Social Media Analysis Alexandra Balahur editor Erik van der Goot editor Piek Vossen editor Andres Montoyo editor Association for Computational Linguistics Lisboa, Portugal conference publication wiegand-etal-2015-opinion 10.18653/v1/W15-2921 https://aclanthology.org/W15-2921/ 2015-09 148 155