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1993PAZh...19..995L - Pis'ma Astron. Zh., 19, 995 (1993)
Optical variability of Seyfert galactic nuclei NGC 3516 and NGC 5548 on timescales from 20 years to 20 minutes.
LYUTY V.M. and DOROSHENKO V.T.
Journal keyword(s):
Simbad objects: 4
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