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WikiPedia: Nikkei_225 http://finance.google.com/finance?q=INDEXNIKKEI:NI... http://finance.yahoo.com/q?s=%5EN225&d=t http://indexes.nikkei.co.jp/ http://indexes.nikkei.co.jp/en/nkave/index/profile https://www.wikidata.org/wiki/Q507338#P856 https://commons.wikimedia.org/wiki/Category:Nikkei...