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1981ApJ...243...53W - Astrophys. J., 243, 53-59 (1981)
Variable X-ray spectra of BL Lacertae objects: HEAO 1 observations of PKS 0548-322 and 2A 1219+305.
WORRALL D.M., BOLDT E.A., HOLT S.S., MUSHOTZKY R.F. and SERLEMITSOS P.J.
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Simbad objects: 3
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