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Yoo Yeon-seok Yoo Young-jin Yoo Young-chul Yoo Yeon-jung Yoo Young-jae Yoo Yeon-seung Yoo Jae-suk Yoo Seung-ho Yoo Ah-in Yoo In-naTài liệu tham khảo
WikiPedia: Yoo_Young-chul http://english.chosun.com/site/data/html_dir/2004/... http://english.chosun.com/site/data/html_dir/2004/... http://m.koreatimes.co.kr/phone/news/view.jsp?req_... https://www.bloomberg.com/news/articles/2017-02-22... https://web.archive.org/web/20141112063430/http://...