http://www.yomiuri.co.jp/atmoney/news/20130121-OYT1T01047.htm

http://gigazine.net/news/20130122-docomo-2013-spring-2/

http://www.ringolab.com/note/daiya/2013/01/post-1762.html

http://gigazine.net/news/20130120-mile-gallone-quarter/

http://www.nnn.co.jp/news/130122/20130122007.html

http://www.yomiuri.co.jp/national/news/20130122-OYT1T01188.htm?from=main4

http://www.yomiuri.co.jp/national/news/20130122-OYT1T00404.htm

http://headlines.yahoo.co.jp/hl?a=20130123-00000012-asahi-soci