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3. Aki, K. (1961): Crustal structure in Japan from the phase velocity of Rayleigh waves: Part 1. Use of the network of seismological stations operated by the Japan Meteorological Agency. Bulletin of Earthquake Research Institute, University of Tokyo, 39, 255-283.
4. Aki, K. (1966): Generation and propagation of G waves from the Niigata earthquake of June 16, 1964. Part 2. Estimation of earthquake moment, released energy, and stress-strain drop from the G-wave spectrum. Bulletin of Earthquake Research Institute, University of Tokyo, 44, 73-88.
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