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- [8] On the correlation of near infrared and optical variability in NGC 4151 AGN VARIABILITY FROM X-RAYS TO RADIO WAVES, 2006, 360 : 75 - +
- [9] Long-term variability in the optical spectrum of the Seyfert galaxy NGC 2992 ASTRONOMICAL JOURNAL, 2008, 135 (06): : 2048 - 2054
- [10] Timescales of optical continuum variability in NGC4151 ASTRONOMICAL TIME SERIES, 1997, 218 : 273 - 276