@ARTICLE{
author={Shapovalova Alla I,Popovic Luka C,Bochkarev Nikolai G,Burenkov Alexander N,Chavushyan Vahram H,Collin S,Doroshenko VT,Ilic Dragana J,Kovacevic Andjelka B},
year={2009},
title={Long-term variability of the Broad Emission Line profiles in AGN},
journal={NEW ASTRONOMY REVIEWS},
volume={53},
number={7-10},
pages={191-197},
document_type={Proceedings Paper},
} 

@ARTICLE{
author={Shapovalova Alla I,Popovic Luka C,Collin S,Burenkov Alexander N,Chavushyan Vahram H,Bochkarev Nikolay G,Benitez E,Dultzin D,Kovacevic Andjelka B,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},
}