Zhao, John X., and Jian Zhang. 2007. “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 40 (1):7-17. https://doi.org/10.5459/bnzsee.40.1.7-17.