http://www.yomiuri.co.jp/world/news/20140228-OYT1T00950.htm

http://www.47news.jp/CN/201402/CN2014022701002307.html

http://business.nikkeibp.co.jp/article/opinion/20140227/260342/

http://www3.nhk.or.jp/news/html/20140228/k10015595971000.html

http://jbpress.ismedia.jp/articles/-/40060

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