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WikiPedia: Billboard_Japan http://www.asahi.com/culture/update/0228/OSK200802... http://www.billboard-japan.com/charts/ http://www.billboard.com/articles/columns/chart-be... http://www.billboard.com/articles/news/1045309/bil... http://www.billboard.com/articles/news/6406322/bil... http://www.billboard.com/biz/articles/news/1178782... http://www.billboard.com/biz/articles/news/1179121... http://www.billboard.com/biz/articles/news/1350338... http://www.dmnews.com/multichannel-marketing/billb... http://www.47news.jp/CN/200609/CN2006091401004831....