http://news.goo.ne.jp/article/asahi/business/K2007090102030.html

http://www.topics.or.jp/contents.html?m1=1&m2=&NB=CORENEWS&GI=National&G=&ns=news_118864240746&v=&vm=1

http://b-spot.seesaa.net/article/23815343.html#more

https://www.kajo.co.jp/modules/shop/index.php?main_page=product_info&cPath=10_115_117&products_id=915

http://headlines.yahoo.co.jp/hl?a=20070902-00000063-san-soci

http://news.goo.ne.jp/article/asahi/nation/K2007090102350.html