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1999AstL...25..569D - Astron. Lett., 25, 569-581 (1999)
H-beta and continuum variability in the Seyfert galaxy Akn 120 from Crimean observations during 1974-1990.
DOROSHENKO V.T., SERGEEV S.G., PRONIK V.I. and CHUVAEV K.K.
Journal keyword(s):
Simbad objects: 5
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