http://japan.techinsight.jp/2017/08/ellis08040729.html

https://headlines.yahoo.co.jp/hl?a=20170803-00010643-miyazaki-l45

http://niben.jp/niben/books/frontier/frontier201707/2017_NO7_50.pdf

https://mainichi.jp/articles/20170808/k00/00m/040/076000c

https://news.yahoo.co.jp/feature/710