ASSOCIATION FOR COMPUTATIONAL LINGUISTICS. Proceedings of the COLING/ACL on Interactive presentation sessions. [S.l.], 2006. p. 69–72. BIRD, S.; KLEIN, E.; LOPER, E. Natural language processing with Python. [S.l.]: O’Reilly Media, Inc., 2009. PAVLOPOULOS, J.; ANDROUTSOPOULOS, I. Aspect term extraction for sentiment analysis: New datasets, new evaluation measures and an improved unsupervised method. Proceedings of LASMEACL, p. 44–52, 2014.