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1976MNRAS.176p..61O - Mon. Not. R. Astron. Soc., 176, part no 16, 61-66 (1976)
NGC 4151 and Markarian 6 - two intermediate-type Seyfert galaxies.
OSTERBROCK D.E. and KOSKI A.
Journal keyword(s):
Simbad objects: 2
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