Prototypical Opinion Holders: What We can Learn from Experts and Analysts Michael Wiegand author Dietrich Klakow author 2011-09 text Proceedings of the International Conference Recent Advances in Natural Language Processing 2011 Ruslan Mitkov editor Galia Angelova editor Association for Computational Linguistics Hissar, Bulgaria conference publication wiegand-klakow-2011-prototypical https://aclanthology.org/R11-1039/ 2011-09 282 288