Tài liệu tham khảo WikiPedia: NGC_7742 http://nedwww.ipac.caltech.edu/ http://www.cbat.eps.harvard.edu/lists/Supernovae.h... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC... //arxiv.org/abs/astro-ph/0205196 //arxiv.org/abs/astro-ph/0512431 //doi.org/10.1086%2F341786 //doi.org/10.1086%2F499945 http://server1.wikisky.org/starview?object=NGC+774... http://www.wikisky.org/?object=NGC+7742
