SPECTRAL OPTICAL MONITORING OF THE NARROW-LINE SEYFERT 1 GALAXY Ark 564A. I. Shapovalova, E. De la Fuente, Luka Č. Popović et al.|The Astrophysical Journal Supplement Series|2012Cited by 100
FLARE-LIKE VARIABILITY OF THE Mg II λ2800 EMISSION LINE IN THE γ-RAY BLAZAR 3C 454.3J. León-Tavares, A. Lähteenmäki, T. G. Arshakian et al.|The Astrophysical Journal Letters|2013Cited by 91
Long-term variability of the optical spectra of NGC 4151A. I. Shapovalova, J. León-Tavares, Luka Č. Popović et al.|Astronomy and Astrophysics|2009Cited by 90
EVIDENCE FOR PERIODICITY IN 43 YEAR-LONG MONITORING OF NGC 5548E. Bon, Marko Stalevski, S. Zucker et al.|The Astrophysical Journal Supplement Series|2016Cited by 83
Long-term variability of the optical spectra of NGC 4151A. I. Shapovalova, V. E. Zhdanova, Luka Č. Popović et al.|Astronomy and Astrophysics|2008Cited by 74