%0 Conference Article %T Optical spectroscopy of host-galaxies of intermediate mass black holes: evolution of central black holes %A Goradzhanov, V.. %A Chilingarian, I.. %A Demianenko, M.. %A Katkov, I.. %A Grishin, K.. %A Toptun, V.. %A Rubtsov, E.. %A Gasymov, D.. %A Kuzmin, I.. %K cosmology: observations; early universe; galaxies: active, nuclei, Seyfert; quasars: supermassive black holes %J Modern astronomy: from the Early Universe to exoplanets and black holes %D 2024 %P 5 %I Special Astrophysical Observatory of the Russian Academy of Sciences