NGC 40 (Swedish Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 40" in Swedish language version.

refsWebsite

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cseligman.com

”Celestial Atlas – NGC Objects: NGC 1 - 49”. http://cseligman.com/text/atlas/ngc0.htm#40. Läst 6 april 2014.

harvard.edu

chandra.harvard.edu

”Chandra X-Ray Observatory”. http://chandra.harvard.edu/photo/2005/n40/. Läst 6 april 2014.

u-strasbg.fr

simbad.u-strasbg.fr

”Basic data : NGC 40 -- Planetary Nebula”. SIMBAD. AAVSO - American Association for Variable Star Observers. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=SN+2005ap&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. Läst 6 april 2014.