1. Thumbs up or thumbs down?Semantic orientation applied to unsupervised classification of reviews;Turney,2002
2. Thumbs up? Sentiment classification using machine learning techniques;Pang,2002
3. SemEval-2014 task 4: aspect based sentiment analysis;Pontiki,2014
4. DCU: Aspect-based polarity classification for semeval task 4;Wagner,2014
5. NRC-Canada-2014: Detecting Aspects and Sentiment in Customer Reviews;Kiritchenko,2014