Buurman, Helena and West, M.E., 2010, Seismic precursors to volcanic explosions during the 2006 eruption of Augustine Volcano, chapter 2 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, p. 41-57 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter02.pdf].
chapter PDF on USGS website