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- [2] INTERPRETATION OF HE II LAMBDA-4686 EMISSION-LINE IN HDE 226868 (CYGNUS X-1) ASTROPHYSICAL JOURNAL, 1974, 190 (02): : L59 - L62
- [3] A LOWER LIMIT ON THE MAGNITUDE OF THE COMPANION TO HDE-226868 (CYGNUS X-1) ASTROPHYSICAL JOURNAL, 1980, 240 (02): : 612 - 618
- [4] X-RAY AND ULTRAVIOLET SPECTROSCOPY OF CYGNUS X-1 = HDE-226868 ASTROPHYSICAL JOURNAL, 1980, 237 (03): : L71 - L75
- [5] THE PRIMARY ORBIT AND THE ABSORPTION-LINES OF HDE-226868 (CYGNUS X-1) ASTROPHYSICAL JOURNAL, 1987, 321 (01): : 425 - 437
- [7] A SEARCH FOR PERIODS LONGER THAN 5.6 DAYS IN THE OPTICAL-SPECTRUM OF HDE-226868 = CYGNUS X-1 ASTROPHYSICAL JOURNAL, 1984, 276 (01): : L17 - L19
- [9] THE OPTICAL-SPECTRUM OF HDE-226868 = CYGNUS X-1 .1. RADIAL-VELOCITIES AND ORBITAL ELEMENTS ASTROPHYSICAL JOURNAL, 1982, 260 (01): : 240 - 248
- [10] RADIO VARIABILITY OF HDE 226868 (CYGNUS X-1) ASTROPHYSICAL JOURNAL, 1973, 182 (01): : L29 - L31