Which Side are You on? Identifying Perspectives at the Document and Sentence Levels Wei-Hao Lin author Theresa Wilson author Janyce Wiebe author Alexander Hauptmann author 2006-06 text Proceedings of the Tenth Conference on Computational Natural Language Learning (CoNLL-X) Lluís Màrquez editor Dan Klein editor Association for Computational Linguistics New York City conference publication lin-etal-2006-side https://aclanthology.org/W06-2915/ 2006-06 109 116