NGC 9 (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 9" in Russian language version.

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arxiv.org

astrobuysell.com

astronomy-mall.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. 283. — 648 p. — ISBN 9781139490108.

doi.org

dx.doi.org

haroldcorwin.net

harvard.edu

adsabs.harvard.edu

ui.adsabs.harvard.edu

hathitrust.org

babel.hathitrust.org

  • Struve O. Entdeckung einiger schwacher Nebelflecke (нем.) // Melanges mathematiques et astronomiques: tires du Bulletin de l'Academie imperiale des sciences de St.-Petersbourg. — Académie Impériale des Sciences de St.-Petersbourg, 1866. — Bd. 3. — S. 689—694.

ngcicproject.org

web.archive.org

wikidata.org

worldcat.org