Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicityC. M. Raiteri, Xue-Bing Wu, L. Lanteri et al.|Astronomy and Astrophysics|2001Cited by 199
Day‐Scale Variability of 3C 279 and Searches for Correlations in Gamma‐Ray, X‐Ray, and Optical BandsR. C. Hartman, John W. Wilson, M. Villata et al.|The Astrophysical Journal|2001Cited by 69
Intensive monitoring of OJ 287T. Pursimo, R. Rekola, L. O. Takalo et al.|Astronomy & Astrophysics Supplement Series|2000Cited by 69