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
EVIDENCE FOR PERIODICITY IN 43 YEAR-LONG MONITORING OF NGC 5548E. Bon, Marko Stalevski, N. Bon 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
Long-term optical spectral monitoring of a changing-look active galactic nucleus NGC 3516 – I. Continuum and broad-line flux variabilityA. I. Shapovalova, V. E. Zhdanova, Luka Č. Popović et al.|Monthly Notices of the Royal Astronomical Society|2019Cited by 60
Spectral optical monitoring of 3C 390.3 in 1995–2007A. I. Shapovalova, E. De la Fuente, Luka Č. Popović et al.|Astronomy and Astrophysics|2010Cited by 55