http://www.nikkei.com/article/DGKKZO99677410V10C16A4EA2000/

http://headlines.yahoo.co.jp/hl?a=20160416-00000026-san-l12

http://this.kiji.is/93275319236298235?c=39546741839462401

http://www.sankei.com/west/news/160415/wst1604150107-n1.html