Automatic Expansion of Feature-Level Opinion Lexicons Fermín L Cruz author José A Troyano author F Javier Ortega author Fernando Enríquez author 2011-06 text Proceedings of the 2nd Workshop on Computational Approaches to Subjectivity and Sentiment Analysis (WASSA 2.011) Alexandra Balahur editor Ester Boldrini editor Andres Montoyo editor Patricio Martinez-Barco editor Association for Computational Linguistics Portland, Oregon conference publication cruz-etal-2011-automatic https://aclanthology.org/W11-1716/ 2011-06 125 131