http://toyokeizai.net/articles/-/184696

http://www.nikkei.com/article/DGXMZO19885930Q7A810C1000000/

https://headlines.yahoo.co.jp/hl?a=20170818-00000520-san-soci

https://news.yahoo.co.jp/feature/721 https://twitter.com/okaguchik/status/767753889256910848 https://twitter.com/okaguchik/status/872362768531431425 https://twitter.com/okaguchik/status/710381273701744640

http://www.asahi.com/articles/DA3S12874177.html