@ARTICLE{
author={Shapovalova Alla I|,Popovic Luka C|0000-0003-2398-7664,Burenkov Alexander N|,Chavushyan Vahram H|,Ilic Dragana J|0000-0002-1134-4015,Kovacevic Andjelka B|0000-0001-5139-1978,Kollatschny Wolfram|,Kovacevic Jelena M|0000-0002-1593-707X,Bochkarev Nikolay G|,Valdes JR|,Torrealba J|,Leon-Tavares J|,Mercado Abelardo|,Benitez E|,Carrasco L|,Dultzin D|,de la Fuente E|},
year={2012},
title={Spectral Optical Monitoring of the Narrow-Line Seyfert 1 Galaxy Ark 564},
journal={ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES},
volume={202},
number={1},
pages={-},
document_type={Article},
} 

@ARTICLE{
author={Shapovalova Alla I|,Popovic Luka C|0000-0003-2398-7664,Collin S|,Burenkov Alexander N|,Chavushyan Vahram H|,Bochkarev Nikolay G|,Benitez E|,Dultzin D|,Kovacevic Andjelka B|0000-0001-5139-1978,Borisov N|,Carrasco L|,Leon-Tavares J|,Mercado Abelardo|,Valdes JR|,Vlasuyk VV|,Zhdanova VE|},
year={2008},
title={Long-term variability of the optical spectra of NGC 4151 - I. Light curves and flux correlations},
journal={ASTRONOMY & ASTROPHYSICS},
volume={486},
number={1},
pages={99-U81},
document_type={Article},
} 

@ARTICLE{
author={Popovic Luka C|0000-0003-2398-7664,Shapovalova Alla I|,Chavushyan Vahram H|,Ilic Dragana J|0000-0002-1134-4015,Burenkov Alexander N|,Mercado Abelardo|,Bochkarev Nikolay G|},
year={2008},
title={Probing the physical properties of the NGC 5548 broad line region using balmer lines},
journal={PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN},
volume={60},
number={1},
pages={1-9},
document_type={Article},
}