NGC 4642 (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 4642" in Russian language version.

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  • Bratton M. NGC4642 // The Complete Guide to the Herschel Objects: Sir William Herschel's Star Clusters, Nebulae and Galaxies (англ.). — Cambridge University Press, 2011. — P. 518. — viii+584 p. — ISBN 9780521768924.

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