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1981ApJ...244L..73K - Astrophys. J., 244, L73-L77 (1981)
The 1980 June X-ray high state of Cygnus X-1: optical changes.
KEMP J.C., BARBOUR M.S. and McBIRNEY R.E.
Journal keyword(s):
Simbad objects: 3
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