1. Apple: Siri. https://www.apple.com/jp/ios/siri/
2. Uchida, W., Midori, O.: Shabette-Concier for Raku-Raku Smartphone: Improvements to Voice Agent Service for Senior Users (2013)
3. Suzuki, A., Gomi, R., Kaneko, T., Shimokawara, E., Yamaguchi, T.: Development of matching mechanism for co-occurrence and mutual assistance in community. In: System Integration of the 15th, 2G3-1, Japan, December 2014
4. Inaba, M., Iwata, N., Toriumi, F., Hirayama, T., Enokibori, Y., Takahashi, K., Mase, K.: Constructing a non-task-oriented dialogue agent using statistical response method and gamification. In: ICAART, vol. 1, pp. 14–21 (2014)
5. Tsukahara, H., Uchiumi, K.: Dialogue generation using the label propagation over a correlation network of words and utterance patterns. In: The 29th Annual Conference of the Japanese Society for Artificial Intelligence, 2L4-OS-07a-7, June 2015 (Japanese)