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WikiPedia: Hiện_tượng_quan_sát_thấy_UFO_ở_Hoa_Kỳ http://edition.cnn.com/2007/TECH/science/11/09/sim... http://fortune.com/2018/03/29/american-airlines-pi... http://hudsonreporter.com/view/full_story/2414454/... http://www.livescience.com/3470-nj-men-fined-250-u... http://blog.newsweek.com/blogs/labnotes/archive/20... http://www.newsweek.com/ufo-sighting-new-mexico-ar... http://www.nj.com/news/index.ssf/2012/02/even_weir... http://www.skeptic.com/eskeptic/09-04-01.html http://www.nuforc.org/mancla.html http://www.sfmuseum.org/hist9/aaf2.html