1. R.W.Clough, J.Penzien, Dynamics of Structures. Berkeley, CA: Computers & Structures, Inc. 731 (2003).
2. Chopra A.K. Dynamics of Structures: Theory and Applications to Earthquake Engineering 3rd Edition. Pearson/Prentice Hall. 1657 (2007).
3. M.A. Biot, Mechanical Analyzer for the Prediction of Earthquake Stresses. Bull. Of the Seism. Sos. Amer. 31, 51–71, (1941).
4. M.A. Biot, Analytical and Experimental Methods in Engineering Seismology. Trans. ASCE 108, 365–408 (1943).
5. A.S. Veletsos, Deformation Spectra for Elastic and Elastoplastic Systems Subjected to Ground Shock and Earthquake Motions. Proc. Third World Conf. Earth. Engineering. Auckland and Wellington. New Zealand. 2.663–82.