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1987IAUS..121..109O - 121st Symposium of the IAU held in Byurakan, Armenia, USSR, June 3-7, 1986 Ed. by Khachikian E.Y., Fricke K.J., Melnick J., 121, 109-118 (1987)
Seyfert galaxies: classification, morphology, observations at optical wavelengths, environmental factors.
OSTERBROCK D.E.
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Simbad objects: 10
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