Zahn, F. A., R. Park, and M. J. N. Priestley. “The Use of Grade 380 Steel for Transverse Confining Reinforcement in Columns”. Bulletin of the New Zealand Society for Earthquake Engineering, Vol. 20, no. 2, June 1987, pp. 99-115, doi:10.5459/bnzsee.20.2.99-115.