Two-stage Clustering Method for Discovering People's Perceptions: A Case Study of the COVID-19 Vaccine from Twitter. - Takako Hashimoto; Takeaki Uno; Yuka Takedomi; David Lawrence Shepard; Masashi Toyoda; Naoki Yoshinaga 001; Masaru Kitsuregawa; Ryota Kobayashi (IEEE BigData, 2021)

Evolution of the public opinion on COVID-19 vaccination in Japan. - Yuri Nakayama; Yuka Takedomi; Towa Suda; Takeaki Uno; Takako Hashimoto; Masashi Toyoda; Naoki Yoshinaga 001; Masaru Kitsuregawa; Luis E. C. Rocha; Ryota Kobayashi (CoRR, 2022)