QSO X-ray spectral evolution
Journal article published in 1998 by
A.~J J. Blair,
G.~C C. Stewart,
I. Georgantopoulos,
B.~J J. Boyle,
O. Almaini 
,
T. Shanks ,
K.~F F. Gunn,
R.~E E. Griffiths
,
T. Shanks ,
K.~F F. Gunn,
R.~E E. Griffiths
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