Irvine, H. M. “‘Slenderness Effects in Earthquake Resisting frames’ - A. L. Andrews: Bulletin of N.Z. National Society for Earthquake Engineering, Vol. 10, No. 3 , September, 1977”. Bulletin of the New Zealand Society for Earthquake Engineering 11, no. 1 (March 31, 1978): 71–75. Accessed June 19, 2026. https://bulletin.nzsee.org.nz/article/view/1127.