1. Akita, F. (1986): Geophysical logging analyses of a geothermal well—A case study of the geothermal well Abuta GSH 1—. Report of the Geological Survey of Hokkaido, 61, 1-18.
2. Akita, F. and Hayakawa, F. (1992): Toya-ko and Sobetsu hot springs. Geothermal Energy (Journal of the New Energy Foundation), 17, 380-401.*
3. Akita, F., Shibata, T., Suzuki, A., Matsushima, N. and Sato, T. (2000): Changes of hot spring and groundwater associated with the 2000 eruption of Usu volcano. Journal of Hot Spring Sciences (Journal of the Balneological Society of Japan), 50, 43-46.
4. Akita, F., Tsuneta, Y. and Urakami, K. (2001): Thermal water flow system in the Toya-ko hot spring area, southwestern Hokkaido, Japan. Journal of Hot Spring Sciences (Journal of the Balneological Society of Japan), 50, 204-220.
5. Akita, F., Shibata, T., Uchino, E., Ichihashi, T. and Aoyanagi, N. (2003): Investigation of hot spring resources in Toya and Sobetsu Onsen, Hokkaido, Japan. in Reports on the Survey of Land Conditions for Reconstruction Assistance of Disaster Recovery from the 2000 Eruption of the Usu Volcano (Usuzan Kazan Katsudo Saigai Fukko Shien Tochi Joken To Chosa Hokoku), Geological Survey of Hokkaido, 97-137.*