http://blog.goo.ne.jp/j-j-n/e/72cc7daca3f52aa7f1d09ab4052c1b41

http://www.asahi.com/articles/ASK575S9NK57UTFK006.html

http://www.sankei.com/world/news/170508/wor1705080058-n1.html

http://www.daily-tohoku.co.jp/news/kita_ar/20170504/201705030P172104.html

https://headlines.yahoo.co.jp/hl?a=20170506-00000032-asahi-soci