Tài liệu tham khảo WikiPedia: NGC 1851 http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... http://photojournal.jpl.nasa.gov/catalog/PIA07908 //arxiv.org/abs/0801.0871 //arxiv.org/abs/1008.2755 //arxiv.org/abs/1108.4402 //arxiv.org/abs/1709.02915 //doi.org/10.1088%2F0004-6256%2F140%2F6%2F1830 //doi.org/10.1088%2F0004-637X%2F742%2F1%2F51 //doi.org/10.1093%2Fmnras%2Fstx2353
