Tài liệu tham khảo WikiPedia: NGC_2623 http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... //arxiv.org/abs/astro-ph/0606440 //doi.org/10.1086%2F498708 //doi.org/10.1086%2F516636 https://ui.adsabs.harvard.edu/abs/2006AJ....131.11... https://ui.adsabs.harvard.edu/abs/2007ApJS..173..1... https://ui.adsabs.harvard.edu/abs/2009yCat.2294...... https://www.nasa.gov/image-feature/goddard/2017/hu...
