Berrill, J. B., M. J. N. Priestley, and H. E. Chapman. “Section 2
 Design Earthquake Loading and Ductility Demand”. Bulletin of the New Zealand Society for Earthquake Engineering 13, no. 3 (September 30, 1980): 232–241. Accessed September 6, 2026. https://bulletin.nzsee.org.nz/article/view/1006.