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- [7] OBSERVATIONS OF QUASI-PERIODIC OSCILLATIONS FROM GX-5-1 AND CYGNUS X-2 WITH THE EINSTEIN (HEAO-2) OBSERVATORY ASTROPHYSICAL JOURNAL, 1986, 308 (02): : 655 - 660
- [8] NEW HARD X-RAY SOURCES OBSERVED WITH HEAO-A-2 ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1979, 40 (03): : 657 - 665
- [10] OBSERVATIONS OF CYGNUS-X-3 WITH THE EINSTEIN (HEAO-2) X-RAY OBSERVATORY - THE PERIOD DERIVATIVE AND THE ASYMMETRIC X-RAY LIGHT-CURVE ASTROPHYSICAL JOURNAL, 1980, 239 (01): : 335 - 344