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WikiPedia: Các_quốc_gia_ABC http://pdfserve.informaworld.com/748507_751319972_... http://www.stormingmedia.us/29/2903/A290393.html https://encyclopedia.1914-1918-online.net/article/... https://web.archive.org/web/20050102003600/http://... https://web.archive.org/web/20060314234505/http://... https://web.archive.org/web/20060517024801/http://... https://web.archive.org/web/20060602025312/http://... https://web.archive.org/web/20070630222358/https:/... https://web.archive.org/web/20120716184403/http://...