http://www.asahi.com/articles/ASJ5T3V58J5TUTIL00J.html

http://headlines.yahoo.co.jp/hl?a=20160525-00000096-asahi-soci

http://www.nikkan-gendai.com/articles/view/newsx/182078/1

http://mainichi.jp/articles/20160525/ddl/k46/010/333000c

http://www3.nhk.or.jp/news/html/20160525/k10010534171000.html http://www.caa.go.jp/soshiki/houan/