Berryman, Kelvin R., and Desmond J. Darby. “Progress in Earth Science Research of Benefit to the Earthquake Insurance Industry
”. Bulletin of the New Zealand Society for Earthquake Engineering 23, no. 2 (June 30, 1990): 130-133. Accessed July 25, 2021. https://bulletin.nzsee.org.nz/index.php/bnzsee/article/view/757.