Djebbar, Nabil, and Nasr-Eddine Chikh. “Limit Period Based on Approximate Analytical Methods Estimating Inelastic Displacement Demands of Buildings”. Journal of Civil Engineering and Management 13, no. 4 (December 31, 2007): 282-290. Accessed November 21, 2019. https://journals.vgtu.lt/index.php/JCEM/article/view/7691.