Masashi Kato, Ryoichi Nagata, Hiroaki Nishino. A Robot TA System Promoting Students' Active Participation in Lectures. In Leonard Barolli, Hiroaki Nishino, Hiroyoshi Miwa, editors, Advances in Intelligent Networking and Collaborative Systems - The 11th International Conference on Intelligent Networking and Collaborative Systems, INCoS 2019, Oita, Japan, September 5-7, 2019. Volume 1035 of Advances in Intelligent Systems and Computing, pages 57-67, Springer, 2019. [doi]