NGC 20 (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 20" in Russian language version.

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arxiv.org

astrobuysell.com

books.google.com

  • Steinicke W. Observing and Cataloguing Nebulae and Star Clusters: From Herschel to Dreyer's New General Catalogue (англ.). — Cambridge University Press, 2010. — P. 288—289, 301—302. — 648 p. — ISBN 9781139490108.

doi.org

dx.doi.org

harvard.edu

adsabs.harvard.edu

iop.org

iopscience.iop.org

ngcicproject.org

u-strasbg.fr

simbad.u-strasbg.fr

web.archive.org

wikidata.org

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worldcat.org