1. Engineering Report on the Caracas Earthquake of 29 July 1967;Sozen,1968
2. Possibility of the Free-oscillations of the Surface-layer excited by the Seismic-waves;Sezawa,1929
3. The Requisite Conditions for the Predominant Vibration of Ground;Kanai,1957
4. On the Predominant Period of Earthquake Motions;Kanai,1962
5. News Report—Tokachioki Earthquake of 1968;Yoshimi;Soils and Foundations,1968