http://www.nikkei.com/article/DGXLASDG28H41_Y5A420C1000000/

http://www.asahi.com/articles/ASH4X1C1FH4WULOB01T.html

http://www.asahi.com/articles/ASH4W5VR4H4WTIPE01Z.html

http://toyokeizai.net/articles/-/67931

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