1. Přichystal, J.: Mobile application for customers’ reviews opinion mining. In: 19th International Conference Enterprise and Competitive Environment 2016, vol. 220, pp. 373–381 (2016)
2. Review decision about the documents by the ratio of a review sentence by classifier a sentence review. Inf. Process. Soc. Jpn. 2012-NL-205(2), 1–5 (2012)
3. Okada, M., Takeuchi, K., Hashimoto, K.: An investigation of an effectiveness of estimation sentence patterns for a classification of customer reviews considering their conditions. In: The 28th Annual Conference of the Japanese Society for Artificial Intelligence, vol. 28, pp. 1–3 (2014)
4. Kobayashi, T., Saitoh, F., Ishizu, S.: Important quality element and preference rule extraction in the case of competition among different types of products. In: The Japan Society for Management Information Autumn National Research Competition, pp. 331–334 (2015)
5. Sawada, H.: Nonnegative matrix factorization and its applications to data/signal analysis. Inst. Electron. Inf. Commun. Eng. 95(9), 829–833 (2012)