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1989BAAS...21..777S - Bull. American Astron. Soc., 21, 777-778 (1989)
The HEAO-1 sky survey sub-catalog of bright, hard X-ray emitting BL Lac objects.
SCHWARTZ D.A., BRISSENDEN R.J.V., TUOHY I.R., FEIGELSON E.D., HERTZ P.L. and REMILLARD R.A.
Journal keyword(s):
Simbad objects: 1
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