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2015Natur.518...74G - Nature, 518, 74-76 (2015)
A possible close supermassive black-hole binary in a quasar with optical periodicity.
GRAHAM M.J., DJORGOVSKI S.G., STERN D., GLIKMAN E., DRAKE A.J., MAHABAL A.A., DONALEK C., LARSON S. and CHRISTENSEN E.
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Simbad objects: 18
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