The detection of two candidate black holes in a dense system of stars in the Milky Way suggests that a larger population of such objects might be lurking in this system. See Letter p.71
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F. MIRABEL (CEA & INST. ASTRON. SPACE PHYS.)/CONICET ARGENTINA/ESA/NASA
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Umbreit, S. Two black holes found in a star cluster. Nature 490, 46–47 (2012). https://doi.org/10.1038/490046a
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DOI: https://doi.org/10.1038/490046a
