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- [3] SMALL-AMPLITUDE COHERENT SIGNALS IN THE X-RAY-EMISSION OF NGC-4151 ASTROPHYSICAL JOURNAL, 1989, 347 (01): : 171 - 178
- [4] NEW RESULTS ON THE X-RAY-EMISSION AND ITS CORRELATION WITH THE ULTRAVIOLET IN NGC-4151 ASTROPHYSICAL JOURNAL, 1986, 306 (02): : 508 - 521
- [9] X-RAY AND ULTRAVIOLET OBSERVATIONS OF THE SEYFERT-GALAXY MCG-8-11-11 ASTROPHYSICAL JOURNAL, 1990, 359 (01): : 98 - 103
- [10] HARD X-RAY-OBSERVATION OF NGC-4151 WITH THE MIFRASO TELESCOPE ASTROPHYSICAL JOURNAL, 1990, 356 (02): : 467 - 471