@inproceedings{wiegand-etal-2015-opinion,
    title = "Opinion Holder and Target Extraction for Verb-based Opinion Predicates {--} The Problem is Not Solved",
    author = "Wiegand, Michael  and
      Schulder, Marc  and
      Ruppenhofer, Josef",
    editor = "Balahur, Alexandra  and
      van der Goot, Erik  and
      Vossen, Piek  and
      Montoyo, Andres",
    booktitle = "Proceedings of the 6th Workshop on Computational Approaches to Subjectivity, Sentiment and Social Media Analysis",
    month = sep,
    year = "2015",
    address = "Lisboa, Portugal",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/W15-2921/",
    doi = "10.18653/v1/W15-2921",
    pages = "148--155"
}