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1979ApJ...232L..17M - Astrophys. J., 232, L17-L19 (1979)
A change in the X-ray spectrum of Markarian 421.
MUSHOTZKY R.F., BOLDT E.A., HOLT S.S. and SERLEMITSOS P.J.
Journal keyword(s):
Simbad objects: 1
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