1. Wan, Y., Gao, Q:. An ensemble sentiment classification system of twitter data for airline services analysis. In: 2015 IEEE International Conference on Data Mining Workshop (ICDMW), IEEE, pp. 1318–1325 (2015)
2. Liu, B.: Sentiment analysis and opinion mining. Synthesis Lectures on Human Language Technologies, vol. 5, No. 1, pp. 1–167 (2012)
3. Pang, B., Lee, L., et al.: Opinion mining and sentiment analysis. Foundations and Trends® in Information Retrieval, vol. 2, No. 1–2, pp. 1–135 (2008)
4. Bhadane, C., Dalal, H., Doshi, H.: Sentiment analysis: measuring opinions. Proc. Comput. Sci. 45, 808–814 (2015)
5. Chen, T., Xu, R., He, Y., et al.: Improving sentiment analysis via sentence type classification using BiLSTM-CRF and CNN. Exp. Syst. Appl. 72, 221–230 (2017)