MacRae, Gregory A., Christopher R. Urmson, Warren R. Walpole, Peter Moss, Karissa Hyde, and Charles Clifton. 2009. “Axial Shortening of Steel Columns in Buildings Subjected to Earthquakes”. Bulletin of the New Zealand Society for Earthquake Engineering 42 (4):275-87. https://doi.org/10.5459/bnzsee.42.4.275-287.