http://www.nikkan-gendai.com/articles/view/news/157793/1

http://www.bengo4.com/topics/2782/

http://www.yomiuri.co.jp/local/ibaraki/news/20150308-OYTNT50321.html

http://www.47news.jp/CN/201503/CN2015030901000767.html

http://news.goo.ne.jp/article/jiji/nation/jiji-150309X796.html