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WikiPedia: Cự_Xà http://www.anatomy.usyd.edu.au/glossary/glossary.c... http://www.ianridpath.com/startales/serpens.htm http://www.oxfordreference.com/view/10.1093/oi/aut... http://adsabs.harvard.edu/abs/1943ApJ....98..347T http://adsabs.harvard.edu/abs/1981A&AS...44...47H http://adsabs.harvard.edu/abs/1986ApJ...311..819T http://adsabs.harvard.edu/abs/1996Ap.....39...15P http://adsabs.harvard.edu/abs/2000ApJ...532.1111H http://adsabs.harvard.edu/abs/2007A&A...462.1023R http://adsabs.harvard.edu/abs/2008A&A...485..209A