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Optical and near-IR long-term monitoring of NGC 3783 and MR 2251−178 : evidence for variable near-IR emission from thin accretion discs
Lira, Paulina.  Monthly Notices of the Royal Astronomical Society.  v. Vol.415. no. No.2.   2011-08. p. 1290 - 1303... issn: 0035-8711 .   

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