https://mainichi.jp/articles/20170907/k00/00e/040/284000c

https://www.gosen-dojo.com/index.php?key=jomqkhct5-3237#_3237

http://www3.nhk.or.jp/news/html/20170908/k10011132611000.html

http://www.asahi.com/articles/ASK8F4HVVK8FUTIL00L.html

https://headlines.yahoo.co.jp/hl?a=20170909-00000054-mai-soci