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- [7] CYCLOTRON LINES IN THE HARD X-RAY-SPECTRUM OF HERCULES-X-1 ASTROPHYSICAL JOURNAL, 1982, 263 (02): : 803 - 813
- [8] IMPLICATIONS OF CYCLOTRON FEATURES IN THE X-RAY-SPECTRUM OF HERCULES-X-1 ASTROPHYSICAL JOURNAL, 1980, 237 (03): : 970 - 987
- [9] HERCULES-X-1 HARD X-RAY PULSATIONS OBSERVED FROM HEAO-1 ASTROPHYSICAL JOURNAL, 1980, 240 (03): : L127 - L131
- [10] HERCULES-X-1 - HARD X-RAY OBSERVATIONS WITH FINE ENERGY RESOLUTION BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1981, 26 (04): : 569 - 570