Nicolò Vaiana and  Giorgio Serino,  An Advanced Exponential Model for Seismic Isolators Having Hardening or Softening Behavior at Large Displacements.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 199 - 206
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/10006426.