http://gigazine.net/news/20150408-google-secret-hiring/

http://news.livedoor.com/article/detail/9986249/

http://www.mhlw.go.jp/stf/seisakunitsuite/bunya/mangaroudouhou/

http://www.yomiuri.co.jp/world/20150410-OYT1T50062.html?from=ytop_main4

http://blog.livedoor.jp/kazsin/archives/52100949.html