1. and , ‘Simulated earthquake motions’, Report of Earthquake Engineering Research Laboratory, California Institute of Technology, Pasadena, California, April 1968.
2. and , ‘Probabilistic study of behavior of structures during earthquakes’, Report of Earthquake Engineering Research Center, EERC 69–3, University of California, Berkeley, California, March 1969.
3. ‘A Measure of Earthquake Intensity,’ in Seismic Design for Nuclear Power Plants, Ed., The MIT Press, Cambridge, Massachusetts, and London, England, 1970, pp. 438–483.