References
- Fujiwara, S., 1949: Suwako no koori Omiwatari no hanashi. — Tenmon to kisho 16: 40–45.
- Fujiwara, S. & Arakawa, H., 1954: Suwako keppyo kijutsu narabini Omiwatari kijitsuhyo. — Kenkyu jihou 6(5): 127–137.
- Mikami, T. & Ishiguro, N., 1998: Suwako keppyo kiroku kara mita kako 550 nen kan no kiko hendo. — Kisho kenkyu note 191: 73–83.
- Tanaka, M. & Yoshino, M., 1982: Re-examination of the climatic change in central Japan based on freezing dates of Lake Suwa. — Weather 37: 252–259.