http://gigazine.net/news/20130321-google-keep/

http://www.mext.go.jp/a_menu/shotou/seitoshidou/1331896.htm

http://sankei.jp.msn.com/life/news/130320/bdy13032008550000-n1.htm

http://headlines.yahoo.co.jp/hl?a=20130328-00000109-jij-soci

http://www.chunichi.co.jp/article/column/editorial/CK2013032902000115.html

http://www.tokyo-np.co.jp/article/column/editorial/CK2013032802000140.html