Nebulosa planetária (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nebulosa planetária" in Portuguese language version.

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arxiv.org

books.google.com

  • Lardner, D. (1856). «The Stellar Universe. Chapter VI». Popular astronomy. Sir John Herschel describes it as a nebula shaped like a dumb-bell. [S.l.]: Walton and Maberly. p. 35 

doi.org

dx.doi.org

harvard.edu

adsabs.harvard.edu

ui.adsabs.harvard.edu

hubblesite.org

obspm.fr

messier.obspm.fr

spacedaily.com