https://www.nikkei.com/article/DGXMZO28858090R00C18A4NN1000/

http://www.jcp.or.jp/akahata/aik16/2016-04-01/2016040115_02_1.html

http://www.yomiuri.co.jp/national/20180506-OYT1T50006.html

https://headlines.yahoo.co.jp/hl?a=20180506-00000005-kobenext-l28

https://headlines.yahoo.co.jp/hl?a=20180506-00000004-kobenext-l28