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1989MNRAS.240...33G - Mon. Not. R. Astron. Soc., 240, 33-39 (1989)
4U 1722+11 : the discovery of an X-ray selected BL Lac object.
GRIFFITHS R.E., WILSON A.S., WARD M.J., TAPIA S. and ULVESTAD J.S.
Journal keyword(s):
Simbad objects: 5
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