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, vol. 11, no. 1, Mar. 1978, pp. 71-75, doi:10.5459/bnzsee.11.1.71-75.