Thực đơn
NGC_6946Thực đơn
NGC_6946Liên quan
NGC 6946 NGC 6940Tài liệu tham khảo
WikiPedia: NGC_6946 http://ned.ipac.caltech.edu/level5/Dev2/frames.htm... http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://www.gemini.edu/node/116 http://adsabs.harvard.edu/abs/1994cag..book.....S http://adsabs.harvard.edu/abs/2005PASP..117..121L http://cbat.eps.harvard.edu/lists/Supernovae.html //arxiv.org/abs/astro-ph/0412487 http://www.astronomerstelegram.org/?read=10372 http://www.astronomerstelegram.org/?read=10376 //dx.doi.org/10.1086%2F428278