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WikiPedia: NGC_2841 http://cseligman.com/text/atlas/ngc28.htm#2841 http://nedwww.ipac.caltech.edu/ http://nedwww.ipac.caltech.edu/level5/Elmegreen/El... //arxiv.org/abs/astro-ph/0105491 //arxiv.org/abs/astro-ph/9704107 //doi.org/10.1086%2F313041 //doi.org/10.1086%2F322395 //www.worldcat.org/issn/0004-637X https://ui.adsabs.harvard.edu/abs/1997ApJS..112..3... https://ui.adsabs.harvard.edu/abs/2001ApJ...559..2...