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WikiPedia: NGC_533 http://cseligman.com/text/atlas/ngc5.htm#533 http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... //doi.org/10.1086%2F498708 http://www.wikisky.org/?ra=1.4253977777778&de=1.75... https://ui.adsabs.harvard.edu/abs/2006AJ....131.11... https://archive.org/details/sim_astronomical-journ...