| Primary | Bo Pang and Lillian Lee (2004). A Sentimental Education: Sentiment Analysis Using Subjectivity Summarization Based on Minimum Cuts.ACL-04. |
| Supplementary | Feng, Song and Bose, Ritwik and Choi, Yejin (2011). Learning General Connotation of Words using Graph-based Algorithms. EMNLP-2011. |