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Strader, J.; Chomiuk, L.; MacCarone, T. J.; Miller-Jones, J. C. A.; Seth, A. C. (2012). ”Two stellar-mass black holes in the globular cluster M22”. Nature 490 (7418): sid. 71–73. doi:10.1038/nature11490. PMID 23038466. Bibcode: 2012Natur.490...71S.