Oya, Masahiko, Shigeko Haruyama, and Yukihiro Hirai. “Geomorphologic Land Classification Map of Lake Kasumigaura, Kitaura and Their Vicinity, East of Tokyo”. Geografia Fisica e Dinamica Quaternaria 12, no. 1 (June 30, 1989): 47–50. Accessed March 15, 2025. https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/824.