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1988BAAS...20.1024E - Bull. American Astron. Soc., 20, 1024 (1988)
Variability in the steep X-ray spectrum of the quasar PG 1211+143.
ELVIS M., GIOMMI P., McDOWELL J. and WILKES B.
Journal keyword(s):
Simbad objects: 1
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