Messier 69 (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Messier 69" in German language version.

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cseligman.com

J. N. Heasley, K. A. Janes, Robert Zinn, et al.: Hubble Space Telescope Photometry of the Metal-rich Globular Clusters NGC 6624 and NGC 6637. In: The Astronomical Journal 120 (2000), S. 879–893, doi:10.1086/301461