http://www.asahi.com/articles/ASG3043WNG30PIHB00F.html

http://www.yuhikaku.co.jp/books/detail/9784641173958

http://www.47news.jp/CN/201404/CN2014040101001822.html

http://www.moj.go.jp/content/000121486.pdf

http://www.westlawjapan.com/p_affairs/2014/20140331_s.html

http://www.mynewsjapan.com/reports/2003