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WikiPedia: Con_đường_tơ_lụa http://vnexpress.net/Vietnam/The-gioi/Tu-lieu/2007... http://vnexpress.net/Vietnam/The-gioi/Tu-lieu/2007... http://vnexpress.net/Vietnam/The-gioi/Tu-lieu/2007... http://vnexpress.net/Vietnam/The-gioi/Tu-lieu/2007... http://vnexpress.net/Vietnam/The-gioi/Tu-lieu/2007... http://www.vietnamnet.vn/xahoi/doisong/2006/03/549... https://commons.wikimedia.org/wiki/Category:Silk_R...