http://bylines.news.yahoo.co.jp/tsunemiyohei/20161119-00064602/
http://news.livedoor.com/lite/article_detail/12474146/
http://mw.nikkei.com/sp/#!/article/DGXLASGM27H0T_X21C16A2EAF000/
http://www3.nhk.or.jp/news/html/20161226/k10010819661000.html