Andrews , A. L. “A Consideration of P-Delta Effects in Ductile Reinforced Concrete Frames: T. Paulay BNZNSEE Vol. 11, No. 3, 1978”. Bulletin of the New Zealand Society for Earthquake Engineering 12, no. 4 (December 31, 1979): 357–361. Accessed May 19, 2024. https://bulletin.nzsee.org.nz/index.php/bnzsee/article/view/1044.