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- [5] ARIEL-5 HARD X-RAY STUDIES OF THE GALACTIC-CENTER REGION ASTROPHYSICAL JOURNAL, 1981, 243 (01): : 155 - 160
- [6] VARIABILITY OF THE GALACTIC-CENTER IN THE HARD X-RAY RANGE ASTROPHYSICAL JOURNAL, 1992, 385 (01): : L17 - L20
- [8] THE ORBITAL PERIOD OF THE X-RAY BINARY GX-1+4 NEW DEVELOPMENTS IN X-RAY AND ULTRAVIOLET ASTRONOMY, 1995, 16 (03): : 131 - 134
- [10] HARD X-RAY-OBSERVATION OF CENTAURUS-A ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1993, 97 (01): : 105 - 108