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WikiPedia: Thiên thể Hoag http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://nedwww.ipac.caltech.edu/level5/Rings/Rings1... http://adsabs.harvard.edu/abs/1950AJ.....55Q.170H http://adsabs.harvard.edu/abs/1974ApJ...191...61O http://adsabs.harvard.edu/abs/1987ApJ...320..454S http://adsabs.harvard.edu/abs/2013MNRAS.435..475B http://adsabs.harvard.edu/abs/2017MNRAS.471.4027B http://heritage.stsci.edu/2002/21/big.html //arxiv.org/abs/1307.6368 //arxiv.org/abs/1707.06589