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NML CygniTài liệu tham khảo
WikiPedia: NML_Cygni //books.google.com/books?id=EA3cyIPFvU8C&pg=PA57 http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NML... //dx.doi.org/10.1051%2F0004-6361%2F201219587 //dx.doi.org/10.1086%2F382218