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- [7] SPECTROSCOPIC OBSERVATIONS OF OPTICAL CANDIDATE FOR CYGNUS X-1 ASTROPHYSICAL JOURNAL, 1973, 179 (03): : L129 - &
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- [9] THE OPTICAL LIGHT-CURVE OF CYGNUS X-1 PROCEEDINGS OF THE 23RD ESLAB SYMPOSIUM ON TWO TOPICS IN X-RAY ASTRONOMY, VOLS 1 AND 2: X-RAY BINARIES; AGN AND THE X-RAY BACKGROUND, 1989, 296 : 511 - 514
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