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1981ApJ...251..501P - Astrophys. J., 251, 501-507 (1981)
Discovery of a Seyfert 1 galaxy with an unusually soft X-ray spectrum
PRAVDO S.H., NUGENT J.J., NOUSEK J.A., JENSEN K., WILSON A.S. and BECKER R.H.
Journal keyword(s):
Simbad objects: 1
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