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WikiPedia: Betelgeuse http://www.ipac.caltech.edu/outreach/Edu/Regions/i... http://adsabs.harvard.edu/abs/1978A&AS...34....1N http://adsabs.harvard.edu/abs/2000ApJ...537..205R http://adsabs.harvard.edu/abs/2000ApJ...545..454L http://adsabs.harvard.edu/abs/2008AJ....135.1430H http://adsabs.harvard.edu/abs/2009A&A...504..115K http://stars.astro.illinois.edu/sow/betelgeuse.htm... http://cdsads.u-strasbg.fr/abs/1978A&AS...34....1N http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=bet...