NGC 4439 (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 4439" in Russian language version.

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books.google.com

  • Inglis M. NGC 4439 // Observer’s Guide to Star Clusters (англ.). — Springer Science & Business Media, 2013. — P. 91. — 282 p. — (The Patrick Moore Practical Astronomy Series). — ISBN 9781461475675.

doi.org

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harvard.edu

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worldcat.org