Barnard, Scott T. “Results of a Reconnaissance Trip to Mt. Etna, Italy: The Effects of the 2002 Eruption of Etna on the Province of Catania”. Bulletin of the New Zealand Society for Earthquake Engineering, vol. 37, no. 2, June 2004, pp. 47-61, https://doi.org/10.5459/bnzsee.37.2.47-61.