http://www.yomiuri.co.jp/national/news/20140130-OYT1T00805.htm

http://www.tokyo-np.co.jp/article/national/news/CK2014013002000246.html

http://www3.nhk.or.jp/news/html/20140130/k10014884081000.html

http://headlines.yahoo.co.jp/hl?a=20140129-00000028-xinhua-cn

http://diamond.jp/articles/-/47915

http://blog.livedoor.jp/dqnplus/archives/1786575.html

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