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Viking Viking 2 Viking: Battle for Asgard Viking 1 Viking Airlines Viking, Minnesota Viking (định hướng) Viking program Viking, Quận Richland, Bắc Dakota Viking, Quận Traill, Bắc DakotaTài liệu tham khảo
WikiPedia: Viking 2 http://dsc.discovery.com/news/2009/09/28/viking-la... http://www.msss.com/http/ps/life/life.html http://www.spacedaily.com/news/mars-life-00g.html http://nssdc.gsfc.nasa.gov/planetary/viking.html http://www.jpl.nasa.gov/missions/viking-2/ http://solarsystem.nasa.gov //doi.org/10.1029%2F2018JE005544 http://www.planetary.org/news/2008/0806_Alien_Rumo... http://www.sciencemag.org/content/194/4271/1288.ab... //tools.wmflabs.org/geohack/geohack.php?language=v...