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WikiPedia: Firework http://www.austriancharts.at/2011_single.asp http://www.aria.com.au/pages/aria-charts-end-of-ye... http://www.aria.com.au/pages/aria-charts-end-of-ye... http://www.aria.com.au/pages/httpwww.aria.com.aupa... http://www.ultratop.be/fr/annual.asp?year=2011 http://www.ultratop.be/nl/annual.asp?year=2011 http://www.ultratop.be/nl/goud-platina/2011 http://www.billboard.biz/bbbiz/charts/internationa... http://mediaforest.biz/ThisYearCharts.aspx http://www.mediaforest.biz/WeeklyCharts/HistoryWee...