NGC 4657 (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 4657" in Polish language version.

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caltech.edu

David Darling: Hockey Stick (NGC 4656). [w:] Encyclopedia of Science [on-line]. [dostęp 2015-08-21]. (ang.).

Andrew Schechtman-Rook, Kelley M. Hess. NGC 4656UV: A UV-selected Tidal Dwarf Galaxy Candidate. „The Astrophysical Journal”. 750 (2), s. 171, 2012-05-10. DOI: 10.1088/0004-637X/750/2/171. (ang.).