Zhao, J. X., and J. Zhang. “Inelastic Demand Spectra for Bi-Linear Seismic Isolation Systems Based on Nonlinear Time History Analyses and the Response of Lead-Rubber Bearing Isolation Systems Subjected to Near-Source Ground Motions”. Bulletin of the New Zealand Society for Earthquake Engineering, vol. 40, no. 1, Mar. 2007, pp. 7-17, doi:10.5459/bnzsee.40.1.7-17.