3
Observations of Binary Supermassive Black Holes
3.1
External galaxies
3.1.1
Dual SBHs
3.1.2
Evidence for binary SBHs
3.2
Limits on the binarity of the Milky Way Black Hole
http://www.livingreviews.org/lrr-2005-8
© Max Planck Society and the author(s)
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