https://headlines.yahoo.co.jp/article?a=20171107-00000041-sasahi-soci

https://news.yahoo.co.jp/byline/egawashoko/20171108-00077916/

http://www.chunichi.co.jp/s/article/2017110890085226.html

https://www.toben.or.jp/message/libra/pdf/2017_11/p02-21.pdf

https://headlines.yahoo.co.jp/hl?a=20171107-00000038-kyt-soci