Tài liệu tham khảo WikiPedia: Messier_30 http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... http://gclusters.altervista.org/cluster_4.php?ggc=... //arxiv.org/abs/0811.3106 //arxiv.org/abs/1001.4289 //arxiv.org/abs/1008.2755 //arxiv.org/abs/1108.4402 //arxiv.org/abs/1305.3606 //arxiv.org/abs/astro-ph/0606382 //doi.org/10.1051%2F0004-6361%2F201321819 //doi.org/10.1086%2F507572
