Messier 28 (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Messier 28" in Portuguese language version.

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books.google.com

Inglis, Mike (2004), Astronomy of the Milky Way: Observer's guide to the northern sky, ISBN 1852337095, Patrick Moore's Practical Astronomy Series, 1, Springer, p. 21.

Boyles, J.; et al. (2011), «Young Radio Pulsars in Galactic Globular Clusters», The Astrophysical Journal, 742 (1): 51, Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51.
Koleva, M.; et al. (2008), «Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting», Monthly Notices of the Royal Astronomical Society, 385 (4): 1998–2010, Bibcode:2008MNRAS.385.1998K, doi:10.1111/j.1365-2966.2008.12908.x

Shapley, Harlow; Sawyer, Helen B. (1927), «A Classification of Globular Clusters», Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S.
Boyles, J.; et al. (2011), «Young Radio Pulsars in Galactic Globular Clusters», The Astrophysical Journal, 742 (1): 51, Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51.
Koleva, M.; et al. (2008), «Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting», Monthly Notices of the Royal Astronomical Society, 385 (4): 1998–2010, Bibcode:2008MNRAS.385.1998K, doi:10.1111/j.1365-2966.2008.12908.x

Hartmut Frommert e Christine Kronberg (21 de agosto de 2007). «Messier Object 28» (em inglês). SEDS. Consultado em 28 de maio de 2012

«SIMBAD Astronomical Database». Results for NGC 6626. Consultado em 16 de novembro de 2006