(http://www.tbs.co.jp/anime/yumezou/)

(http://gigazine.net/index.php?/news/comments/20090120_db_psp/)

(http://alfalfa.livedoor.biz/archives/51421205.html)

(http://teo.cocolog-nifty.com/column/2008/12/post-5247.html)