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Quasars have long been known to be variable sources at all wavelengths.
Dynamics of warped accretion discs
Tremaine, S. & Davis, S. W · 1964
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Monitoring of active galactic nuclei. I - The quasars 1302 - 102 and 1217 + 023
Jackson, N. et al · 1992
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The optical gravitational lensing experiment. Discovery of the first candidate microlensing event in the direction of the Galactic Bulge
Udalski, A. et al · 1993
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Correlated optical and radio structure in the QSO 1302-102
Hutchings, J. B., Morris, S. C., Gower, A. C. & Lister, M. L · 1994
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Hubble Space Telescope Images of Nearby Luminous Quasars. II. Results for Eight Quasars and Tests of the Detection Sensitivity
Bahcall, J. N., Kirhakos, S. & Schneider, D. P · 1995
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Oke, J. B., et al., The Keck Low-Resolution Imaging Spectrometer, PASP, 107, 375-385 (1995)
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The Close Environment of OJ 287: Underlying Nebulosity and a Possible Optical Jet?
Benitez, E. et al · 1996
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Foster, G., Wavelets for period analysis of unevenly sampled time series, AJ, 112, 1709-1729 (1996)
1996
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Optical monitoring of quasars - I. Variability
Garcia, A., Sodré, L., Jablonski, F. J. & Terlevich, R. J · 1999
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A comparative HST imaging study of the host galaxies of radio-quiet quasars, radio-loud quasars and radio galaxies - I
McLure, R. J. et al · 1999
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Optical Variability of Radio-Luminous PG Quasars
Eggers, D., Shaffer, D. B. & Weistrop, D · 2000
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Raiteri, C. M., et al., Optical and radio variability of the BL Lacertae object AO 0235+16: a possible 5-6 year periodicity, A&A, 377, 396-412 (2001)
2001
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The All Sky Automated Survey. Catalog of Variable Stars. I. 0 h - 6 hQuarter of the Southern Hemisphere
Pojmanski, G · 2002
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Fan, J. H., et al., Optical periodicity analysis for radio selected BL Lacertae objects (RBLs), A&A, 381, 1-5 (2002)
2002
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Larson, S., et al., The CSS and SSS NEO surveys, Bulletin of the American Astronomical Society, 35, 982-982 (2003)
2003
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Vacca, W. D., Cushing, M. C., & Rayner, J. T., A Method of Correcting Near-Infrared Spectra for Telluric Absorption, PASP, 115, 389-409 (2003)
2003
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Greenhill, L. J., et al., A Warped Accretion Disk and Wide-Angle Outflow in the Inner Parsec of the Circinus Galaxy, ApJ, 590, 162-173 (2003)
2003
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Cushing, M. C., Vacca, W. D., & Rayner, J. T., Spextool: A Spectral Extraction Package for SpeX, a 0.8-5.5 Micron Cross-Dispersed Spectrograph, PASP, 116, 362-376 (2004)
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Greene, J. E., & Ho, L. C., Active Galactic Nuclei with Candidate Intermediate-Mass Black Holes, ApJ, 610, 722-736 (2004)
2004
Cited alongside, same era.
Observational Evidence of Jet Precession in Galactic Nuclei Caused by Accretion Disks
Lu, J.-F. & Zhou, B.-Y · 2005
Cited alongside, same era.
Herrnstein, J. R., Moran, J. M., Greenhill, L. J., Trotter, A. S., The Geometry of and Mass Accretion Rate through the Maser Accretion Disk in NGC 4258, ApJ, 629, 719-738 (2005)
2005
Cited alongside, same era.
Skrutskie, M. F., et al., The Two Micron All Sky Survey (2MASS), AJ, 131, 1163-1183 (2006)
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Landolt, A. U., UBVRI Photometric Standard Stars around the Sky at -50 ∘
2007
Cited alongside, same era.
MacLeod, C. L., et al., Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk, ApJ, 721, 1014-1033 (2010)
2010
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Kim, D., Im, M., Kim, M., New Estimators of Black Hole Mass in Active Galactic Nuclei with Hydrogen Paschen Lines, ApJ, 724, 386-399 (2010)
2010
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Exploring the Variable Sky with LINEAR. I. Photometric Recalibration with the Sloan Digital Sky Survey
Sesar, B. et al · 2011
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Testing the 1995 Binary Black Hole Model of OJ287
Valtonen, M. J., Lehto, H. J., Takalo, L. O. & Sillanpää, A · 2011
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A Systematic Search for Massive Black Hole Binaries in the Sloan Digital Sky Survey Spectroscopic Sample
Tsalmantza, P., Decarli, R., Dotti, M. & Hogg, D. W · 2011
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Glikman, E., Helfland, D. J., White, R. L., Becker, R. H., Gregg, M. D., Lacy, M., The FIRST-2MASS Red Quasar Survey, ApJ, 667, 673-703 (2007)
2007
Cited alongside, same era.
A massive binary black-hole system in OJ287 and a test of general relativity
Valtonen, M. J. et al · 2008
Cited alongside, same era.
Modeling of Emission Signatures of Massive Black Hole Binaries. I. Methods
Bogdanović, T., Smith, B. D., Sigurdsson, S. & Eracleous, M · 2008
Cited alongside, same era.
Kondratko, P. T., Greenhill, L. J., Moran, J. M., , The Parsec-Scale Accretion Disk in NGC 3393, ApJ, 678, 87-95 (2008)
2008
Cited alongside, same era.
Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
Kelly, B. C., Bechtold, J. & Siemiginowska, A · 2009
Cited alongside, same era.
Exploring the Optical Transient Sky with the Palomar Transient Factory
Rau, A. et al · 2009
Cited alongside, same era.
First Results from the Catalina Real-Time Transient Survey
Drake, A. J. et al · 2009
Cited alongside, same era.
Discovery, classification, and scientific exploration of transient events from the Catalina Real-time Transient Survey
Mahabal, A. A. et al · 2011
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A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 7
Shen, Y. et al · 2011
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Shen, Y., et al., A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 7, ApJS, 194, 45 (2011)
2011
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Kudryavtseva, N. A., et al., A possible jet precession in the periodic quasar B0605-085, A&A, 526, A51-A64 (2011)
2011
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Kuo, C. Y., et al., The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks, ApJ, 727, 20-34 (2011)
2011
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Search for Supermassive Black Hole Binaries in the Sloan Digital Sky Survey Spectroscopic Sample
Ju, W., Greene, J. E., Rafikov, R. R., Bickerton, S. J. & Badenes, C · 2013
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Constraining Sub-parsec Binary Supermassive Black Holes in Quasars with Multi-epoch Spectroscopy. I. The General Quasar Population
Shen, Y., Liu, X., Loeb, A. & Tremaine, S · 2013
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Nine-year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
Hinshaw, G. et al · 2013
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Structure and Evolution of Circumbinary Disks around Supermassive Black Hole Binaries
Rafikov, R. R · 2013
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2013
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McQuillan, A., Aigrain S., Mazeh, T., Measuring the rotation period distribution of field M dwarfs with Kepler, MNRAS, 1203-1216 (2013)
2013
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Shen, Y., The mass of quasars, Bull. Ast. Soc. India
2013
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Binary Black Hole Accretion from a Circumbinary Disk: Gas Dynamics inside the Central Cavity
Farris, B. D., Duffell, P., MacFadyen, A. I. & Haiman, Z · 2014
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