Hogan, L.S., L.M. Wotherspoon, S. Beskhyroun, and J.M. Ingham. 2012. “Modal Identification of a Bridge-Abutment System Using Forced Vibration Testing”. Bulletin of the New Zealand Society for Earthquake Engineering 45 (4):161-70. https://doi.org/10.5459/bnzsee.45.4.161-170.