NGC 21 (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 21" in Russian language version.

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arxiv.org (Global: 69th place; Russian: 148th place)

astrobuysell.com (Global: low place; Russian: low place)

cseligman.com (Global: low place; Russian: low place)

doi.org (Global: 2nd place; Russian: 3rd place)

dx.doi.org

haroldcorwin.net (Global: low place; Russian: low place)

harvard.edu (Global: 18th place; Russian: 63rd place)

ui.adsabs.harvard.edu

  • Dreyer J. L. E. New general catalogue of nebulæ and clusters of stars, being the Catalogue of the late Sir John F. W. Herschel, Bart, revised, corrected, and enlarged (англ.) // Memoirs of the Royal Astronomical Society. — London, 1888. — Vol. 49. — P. 1—237. — Bibcode:1888MmRAS..49....1D.

u-strasbg.fr (Global: 1,342nd place; Russian: 1,257th place)

simbad.u-strasbg.fr

web.archive.org (Global: 1st place; Russian: 1st place)

  • Dreyer J. L. E. New general catalogue of nebulæ and clusters of stars, being the Catalogue of the late Sir John F. W. Herschel, Bart, revised, corrected, and enlarged (англ.) // Memoirs of the Royal Astronomical Society. — London, 1888. — Vol. 49. — P. 1—237. — Bibcode:1888MmRAS..49....1D.
  • Markov P. The First 30 NGC objects. Архивировано 20 марта 2012 года.
  • Harold G. Corwin, Jr. Notes on the NGC objects, particularly those missing, misidentified, or otherwise unusual (ngcnotes.all) (англ.). Дата обращения: 17 октября 2019. Архивировано 30 января 2018 года.
  • Seligman C. New General Catalog Objects: NGC 1 - 49 (англ.). cseligman.com. Дата обращения: 17 октября 2019. Архивировано 5 октября 2018 года.

wikidata.org (Global: 43rd place; Russian: 24th place)

wikipedia.org (Global: low place; Russian: low place)

en.wikipedia.org

worldcat.org (Global: 5th place; Russian: 5th place)