NGC 2993 (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 2993" in Polish language version.

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cseligman.com

P.-A. Duc et al.. Formation of a Tidal Dwarf Galaxy in the Interacting System Arp 245 (NGC 2992/93). „The Astronomical Journal”. 120 (3), s. 1238, wrzesień 2000. DOI: 10.1086/301516. (ang.).

List of Supernovae. [w:] IAU Central Bureau for Astronomical Telegrams [on-line]. Międzynarodowa Unia Astronomiczna. [dostęp 2015-01-15]. (ang.).