https://www.waseda.jp/top/news/38038

http://www.sankei.com/west/news/160321/wst1603210027-n1.html

http://www.nikkei.com/article/DGXLASDG20H0T_Q6A320C1000000/

http://lite-ra.com/2016/03/post-2084.html

http://www.sankei.com/affairs/news/160321/afr1603210001-n1.html