G. D. Dellow, S. A. L. Read, J. G. Begg, R. J. Van Dissen, and N. D. Perrin, “Distribution of geological materials in Lower Hutt and Porirua, New Zealand: A component of a ground shaking hazard assessment”, BNZSEE, vol. 25, no. 4, pp. 332–344, Dec. 1992.