Enlace original:
http://repositorio.uchile.cl/handle/2250/125049
Arévalo, P.
,
Uttley, P.
,
Kaspi, S.
,
Breedt, E.
,
Lira Teillery, Paulina
,
McHardy, I. M.
,
[Correlated X-ray/optical variability in the quasar MR 2251-178]