The double sub-giant branch of NGC 6656 (M 22): a chemical characterization
scientific article published in Astronomy and Astrophysics
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author: Yazan Al Momany, Giampaolo Piotto, Michael Hilker, Santi Cassisi, Martin Asplund, Antonino P. Milone, Luigi R. Bedin, Chris Sneden, Peter B. Stetson, Karin Lind, George Wallerstein
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