https://news.yahoo.co.jp/byline/maedatsunehiko/20180524-00085587/

http://proftanuki.jugem.cc/?eid=224

https://headlines.yahoo.co.jp/hl?a=20180523-00000081-san-l10

https://www.asahi.com/articles/ASL5K7F5ZL5KUTIL05S.html

http://www3.nhk.or.jp/shutoken-news/20180524/0012187.html