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WikiPedia: Cầu_lửa http://www.merriam-webster.com/dictionary/bolide http://www.oup.com/oxforddnb/info/freeodnb/librari... https://books.google.com/?id=3Hd8Lw1hExUC https://books.google.com/?id=Dw0A7T0fy6AC https://oed.com/search?searchType=dictionary&q=bol... https://cneos.jpl.nasa.gov/fireballs/ https://woodshole.er.usgs.gov/epubs/bolide/introdu... https://archive.is/20130703201541/http://b612found...