Messier 4 (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Messier 4" in Portuguese language version.

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Marino, A. F.; et al. (2008). «Spectroscopic and photometric evidence of two stellar populations in the Galactic globular cluster NGC 6121 (M 4)». Astronomy and Astrophysics. 490 (2): 625–640. Bibcode:2008A&A...490..625M. doi:10.1051/0004-6361:200810389
Dinescu, Dana I.; Girard, Terrence M.; van Altena, William F. (1999). «Space Velocities of Globular Clusters. III. Cluster Orbits and Halo Substructure». The Astronomical Journal. 117 (4): 1792–1815. Bibcode:1999AJ....117.1792D. doi:10.1086/300807

Caputo, F.; Castellani, V.; Quarta, M. L. (1985). «Reddening, distance modulus and age of the globular cluster NGC 6121 (M4) from the properties of RR Lyrae variables». Astronomy and Astrophysics. 143 (1): 8–12. Bibcode:1985A&A...143....8C
Marino, A. F.; et al. (2008). «Spectroscopic and photometric evidence of two stellar populations in the Galactic globular cluster NGC 6121 (M 4)». Astronomy and Astrophysics. 490 (2): 625–640. Bibcode:2008A&A...490..625M. doi:10.1051/0004-6361:200810389
Dinescu, Dana I.; Girard, Terrence M.; van Altena, William F. (1999). «Space Velocities of Globular Clusters. III. Cluster Orbits and Halo Substructure». The Astronomical Journal. 117 (4): 1792–1815. Bibcode:1999AJ....117.1792D. doi:10.1086/300807

Hartmut Frommert ,Christine Kronberg (21 de agosto de 2007). «Messier Object 4» (em inglês). SEDS. Consultado em 25 de maio de 2012