Cousins, W.J., Zhao, J.X. and Perrin, N.D. (1999) “A model for the attenuation of peak ground acceleration in New Zealand earthquakes based on seismograph and accelerograph data”, Bulletin of the New Zealand Society for Earthquake Engineering, 32(4), pp. 193–220. doi:10.5459/bnzsee.32.4.193-220.