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Messier 13 Messier 15 Messier 102 Messier 110 Messier 100 Messier 106 Messier 39 Messier 73 Messier 14 Messier 30Tài liệu tham khảo
WikiPedia: Messier_13 http://www.imagingtheuniverse.com/Star-Clusters/Ca... http://www.nightskyinfo.com/archive/m13_globular_c... http://www.stargazer-observatory.com/M13-9.html http://www.waid-observatory.com/m013-ng%C3%A0y http://www.zwire.com/site/news.cfm?newsid=15663534 http://var.astro.cz/oejv/issues/oejv0019.pdf http://www.dsi-astronomie.de/M13AO8H.html http://www.news.cornell.edu/releases/Nov99/Arecibo... http://adsabs.harvard.edu/abs/1992AJ....104.2104L http://simbad.u-strasbg.fr/Simbad