Happy Accident: A Sentiment Composition Lexicon for Opposing Polarity Phrases Svetlana Kiritchenko author Saif Mohammad author 2016-05 text Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC’16) Nicoletta Calzolari editor Khalid Choukri editor Thierry Declerck editor Sara Goggi editor Marko Grobelnik editor Bente Maegaard editor Joseph Mariani editor Helene Mazo editor Asuncion Moreno editor Jan Odijk editor Stelios Piperidis editor European Language Resources Association (ELRA) Portorož, Slovenia conference publication kiritchenko-mohammad-2016-happy https://aclanthology.org/L16-1184/ 2016-05 1157 1164