1. Brown, B. (2019). Beyond recommendations: Local review web sites and their impact. ACM Transactions on Computer-Human Interaction, Vol. 19, No. 4, Article No. 27.
2. Hayashi, T. and Seino, Y. (2017). A method for discriminating travel reviews from commercial speech. Journal of Global Tourism Research, Vol. 2, No. 1, 33-38.
3. Huang, C., Tsai, C., and Chen, W. (2019). A personalized tour recommendation system over Cloud. Human Centric Technology and Service in Smart Space (Springer LNEE 182), 297-302.
4. Jones, K. S. (1972). A statistical interpretation of term specificity and its application in retrieval. Journal of Documentation, Vol. 28, No. 1, 11-21.
5. Kawai, Y., Zhang, J., and Kawasaki, H. (2009). Tour recommendation system based on web information and GIS. Proceedings of IEEE International Conference on Multimedia and Expo, 990-993.