Identifying Sources of Opinions with Conditional Random Fields and Extraction Patterns Yejin Choi author Claire Cardie author Ellen Riloff author Siddharth Patwardhan author 2005-10 text Proceedings of Human Language Technology Conference and Conference on Empirical Methods in Natural Language Processing Raymond Mooney editor Chris Brew editor Lee-Feng Chien editor Katrin Kirchhoff editor Association for Computational Linguistics Vancouver, British Columbia, Canada conference publication choi-etal-2005-identifying https://aclanthology.org/H05-1045/ 2005-10 355 362