Tài liệu tham khảo WikiPedia: NGC_6304 http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?... http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://www.ipac.caltech.edu/2mass/ http://simbad.u-strasbg.fr/sim-id.pl?Ident=NGC%206... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... http://vizier.u-strasbg.fr/viz-bin/VizieR-S?NGC%20... http://www.docdb.net/show_object.php?id=ngc_6304 http://gclusters.altervista.org/cluster_4.php?ggc=... //arxiv.org/abs/1001.4289 //doi.org/10.1111%2Fj.1365-2966.2010.16373.x
