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HD 15558 He 162 He-111 He 112 He 177 Greif He 178 HD 156587 HD 159974 Ho-155Tài liệu tham khảo
WikiPedia: HE_1523-0901 http://www.itwire.com.au/content/view/12098/1066/ http://www.astronomy.com/asy/default.aspx?c=a&id=5... http://www.msnbc.msn.com/id/18612697/ http://physorg.com/news98033554.html http://www.hs.uni-hamburg.de/DE/For/Exg/Sur/hes/in... http://www.perseus.gr/Astro-Star-Oldest-HE-1523-09... //arxiv.org/abs/astro-ph/0703414 //doi.org/10.1086%2F518122 http://mcdonaldobservatory.org/news/releases/2007/... https://www.sciencedaily.com/releases/2007/05/0705...