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WikiPedia: Cờ_Sao_Hỏa http://journals.sagepub.com/doi/pdf/10.2968/056003... http://flagspot.net/flags/fic_sisl.html http://www.planetary.org/blogs/emily-lakdawalla/20... http://www.planetary.org/explore/the-planetary-rep... https://books.google.com/books?id=4w8eAwAAQBAJ&lpg... https://books.google.com/books?id=_jUZe2UUCdUC&pg=... https://web.archive.org/web/20070429203700/http://...