1. https://www.tablecheck.com/ja/company/press/1st-gourmet-site-survey-20200106/ (Feb 10th, 2022 )
2. Sentiments analysis of Twitter data using data mining;Jain,2015
3. Recognizing Contextual Polarity in Phrase-Level Sentiment Analysis;Wilson,2005
4. What Do People Write in Reviews for Sellers? Investigation and Development of an Automatic Classification System-;Shinzato;Journal of Natural Language Processing,2018
5. Using word-of-mouth sites to recommend restaurants for foreign visitors to Japan;Nanya,2019