Furutani, Hiroshi, and Tomoyuki Hiroyasu. “Estimation of COVID-19 Cases in Japanese Prefectures Using a Gumbel Distribution”. Archives of Clinical and Biomedical Research 6, no. 5 (September 20, 2022): 756–763. Accessed June 6, 2026. https://fortunejournals.org/ojs/index.php/acbr/article/view/14955.