http://www3.nhk.or.jp/news/html/20140731/k10013427481000.html

http://www.asahi.com/articles/ASG7Z6FFKG7ZPITB01B.html

http://www.asahi.com/articles/ASG7Z4T7RG7ZUTQP018.html

http://toyokeizai.net/articles/-/43798?display=b

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