To appear in Encyclopedia of Astronomy and
Astrophysics, 2000?
SUPERMASSIVE BLACK HOLES IN ACTIVE GALACTIC NUCLEI
Luis C. Ho
Carnegie Observatories,
813 Santa Barbara St., Pasadena, CA 91101-1292
and
John Kormendy
Department of
Astronomy, RLM 15.308, University of Texas, Austin, TX
78712-1083
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