http://gigazine.net/news/20140222-new-polyhedron-shape/

http://judiciary.asahi.com/outlook/2014020700001.html

http://www.nikkei.com/article/DGXNASDG2404F_U4A220C1CR8000/

http://kanz.jp/hanrei/data/html/201308/20140219141251.html

http://sankei.jp.msn.com/west/west_affairs/news/140224/waf14022411480011-n1.htm http://sankei.jp.msn.com/west/west_affairs/news/140224/waf14022418490025-n1.htm