@InProceedings{TakakoHashimoto:2021, author = {Takako Hashimoto, Takeaki Uno, Yuka Takedomi, David Shepard, Masashi Toyoda, Naoki Yoshinaga, Masaru Kitsuregawa, Ryota Kobayashi}, title = {Two-stage Clustering Method for Discovering People's Perceptions: A Case Study of the COVID-19 Vaccine from Twitter}, booktitle = {2021 IEEE International Conference on Big Data (Big Data)}, year = {2021}, pages = {614-621}, }