Tài liệu tham khảo WikiPedia: NGC_7793 http://www.iflscience.com/space/small-black-hole-h... http://io9.com/5582028/black-hole-emitting-a-giant... http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://www.supernovae.net/sn2008/ http://www.supernovae.net/sn2008/#2008bk //arxiv.org/abs/astro-ph/0302045 //doi.org/10.1007%2Fs10511-006-0002-6 //doi.org/10.1051%2F0004-6361:20030170 //doi.org/10.1086%2F382905 //doi.org/10.1098%2Frstl.1828.0010
