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STANDARDISATION OF THE USGS VOLCANO ALERT LEVEL SYSTEM (VALS): ANALYSIS AND RAMIFICATIONS
Fearnley, C.J., McGuire, W.J., Davies, G., and Twigg, J., 2012, Standardisation of the USGS volcano alert level system (VALS): analysis and ramifications: Bulletin of Volcanology, doi:10.1007/s00445-012-0645-6 .