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2002ChJAA...2..207C - Chinese J. Astron. Astrophys., 2, 207-215 (2002)
The variability of hardness ratio 1 observed by ROSAT : narrow-line Seyfert 1 galaxies versus broad-line Seyfert 1 galaxies.
CHENG L.-P., WEI J.-Y. and ZHAO Y.-H.
Journal keyword(s):
Simbad objects: 25
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