Pang, B. & Lee, L. (2008). Opinion mining and sentiment analysis. Foundations and TrendsĀ® in Information Retrieval, 2, 1-135.

Lee, L. (1999). Measures of distributional similarity. Proceedings of the 37th annual meeting of the Association for Computational Linguistics on Computational Linguistics (p./pp. 25--32), Morristown, NJ, USA: Association for Computational Linguistics. ISBN: 1-55860-609-3