1. Asher, N., Benamara, F., Mathieu, Y.Y.: Appraisal of opinion expressions in discourse. Lingvisticæ Investigationes 32(2), 279–292 (2009)
2. Baccianella, S., Esuli, A., Sebastiani, F.: SentiWordNet 3.0: an enhanced lexical resource for sentiment analysis and opinion mining. In: Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC 2010), vol. 10, pp. 2200–2204 (2010)
3. Bickart, B., Schindler, R.M.: Internet forums as influential sources of consumer information. J. Interact. Mark. 15(3), 31–40 (2001)
4. Chen, Y., Xie, J.: Online consumer review: word-of-mouth as a new element of marketing communication mix. Manage. Sci. 54(3), 477–491 (2008)
5. Esuli, A., Sebastiani, F.: SentiWordNet: a publicly available lexical resource for opinion mining. In: Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC 2006), vol. 6, pp. 417–422. European Language Resources Association (ELRA) (2006)