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1987AZh....64..326K - Astron. Zh., 64, 326-344 (1987)
Long-period optical variation of the system Cyg X-1.
KEMP J.C., KARITSKAYA E.A., KUMSIASHVILI M.I., LYUTIJ V.M., KRUZINA T.S. and CHEREPASHCHUK A.M.
Journal keyword(s):
CDS comments: = 1987SvA....31..170K
Simbad objects: 1
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