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WikiPedia: Ngô_Thanh_Nguyên http://gogameguru.com/go-seigen/ http://www.scmp.com/news/china/article/1653238/leg... http://the-japan-news.com/news/article/0001757079 http://www.thuviencovay.com/Home/nhung-ky-thu-noi-... http://senseis.xmp.net/?GoSeigen http://data.bibliotheken.nl/id/thes/p174182813 http://gobase.org/studying/articles/mioch/goseigen... http://gobase.org/studying/articles/mioch/goseigen... http://www.usgo.org/news/2011/06/world-go-news-rou... http://vncovay.org/2008/10/24/phong-van-go-seigen-...