The Role of Predicates in Opinion Holder Extraction Michael Wiegand author Dietrich Klakow author 2011-09 text Proceedings of the RANLP 2011 Workshop on Information Extraction and Knowledge Acquisition Preslav Nakov editor Zornitsa Kozareva editor Kuzman Ganchev editor Jerry Hobbs editor Association for Computational Linguistics Hissar, Bulgaria conference publication wiegand-klakow-2011-role https://aclanthology.org/W11-4004/ 2011-09 13 20