1. Kato Y. —The changes in the Earth's magnetic Field accompanying the volcanic eruption of Miyake-zima, Proceedings of the Imperial Academy, Tokyo, Vol. XVI, November 1940, p. 167.
2. Cfr. p. es.Friedlander I. —Vulkanologie und Geophysik, Gerlands Beitr. zur Geophysik, Vol. 32 (Köppen-Band I), 1931, p. 113.
3. Bossolasco M. —Sulla prospezione geoelettrica dei vulcani, Geofisica pura e applicata, Vol. II, 1940, p. 56.
4. Takahasi R. eNagata T. —Geophysical Studies of Volcano Mihara, Oosima Island. Bull. Earthquake Research Institute, Tokyo, Vol. XV, 1937, p. 441.
5. Minakami T. —Magnetic Surveys of Volcano Asama, Bull. Earthquake Research Institute, Tokyo, Vol. XVI, 1938, p. 100.