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Correlated X-ray/optical variability in the quasar MR 2251-178
(BLACKWELL, 2008-09-21)
Correlated X-ray/ultraviolet/optical variability in the very low mass AGN NGC 4395
(WILEY-BLACKWELL, 2012-05)
Correlation and time delays of the X-ray and optical emission of the Seyfert Galaxy NGC 3783
(WILEY-BLACKWELL, 2009-08-21)