1. G. W. Housner,Limit Design of Structures to resist Earthquakes, Proceedings of the World Conference on Earthquake Engineering, Berkeley, Calif., June 1956.
2. G. W. Housner,The plastic Failure of Frames During Earthquakes, Proceeding of the Second World Conference on Earthquake Engineering, Vol. II, Tokyo and Kyoto, Japan, July 1960.
3. R. Tanabashi,Studies on the Nonlinear Vibrations of Structures Subjected to Destructive Earthquakes, Proceeding of the World Conference on Earthquake Engineering, Berkeley, Calif., June 1956.
4. G. V. Berg andD. A. Da Deppo,Dynamic Analysis of Elasto-Plastic Structures, Journal of the Engineering Mechanics Division, ASCE, Vol. 86, no. EM2, pp. 35–58, April 1960.
5. J. Penzien,Dynamic Response of Elasto-Plastic Frames, Journal of Structural Division ASCE, Vol. 86, no. ST 7, July 1960.