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WikiPedia: Fireflies (bài hát) http://www.austriancharts.at/2010_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=2010 http://www.ultratop.be/nl/annual.asp?year=2010 http://www.ultratop.be/nl/goud-platina/2010 http://www.billboard.biz/bbbiz/charts/yearendchart... http://www.billboard-japan.com/system/jp_charts/ho... http://www.billboard.com/charts/year-end/2009/cana...