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1998AN....319..163B - Astron. Nachr., 319, 163-166 (1998)
Ultrasoft narrow-line Seyfert 1 galaxies and X-ray surveys.
BRANDT N. and BOLLER T.
Journal keyword(s):
Errata: This paper supersedes 1998AN....319....7B.
Simbad objects: 3
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