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WikiPedia: Núi_Etna http://www.swisseduc.ch/stromboli/index-en.html http://www.bbc.com/news/world-europe-39293086 http://www.italymagazine.com/news/mount-etna-becom... http://adsabs.harvard.edu/abs/2008GeoRL..3509305N http://www.volcano.si.edu/world/volcano.cfm?vnum=0... http://quod.lib.umich.edu/m/moa/acl3129.0001.001/6... http://vulcan.wr.usgs.gov/Volcanoes/DecadeVolcanoe... http://vulcan.wr.usgs.gov/Volcanoes/Italy/descript... http://www.etnamount.it http://www.etnanatura.it