1. Opinion mining and sentiment analysis;Pang;FnTIR,2008
2. Seeing stars: Exploiting class relationships for sentiment categorization with respect to rating scales;Pang,2005
3. Thumbs up? Sentiment classification using machine learning techniques;Pang,2002
4. Creating subjective and objective sentence classifiers from unannotated texts;Wiebe,2005
5. Sentiment analysis of short informal texts;Kiritchenko;JAIR,2014