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The perfect case for time-domain investigations are active galactic nuclei(AGNs) since they are luminous objects that show strong variability. Key resultfrom the studies of AGNs variability is the estimated mass of a supermassiveblack hole (SMBH), which resides in the center of an AGN. Moreover, thespectral variability of AGN can be used to study the structure and physics ofthe broad line region, which in general can be hardly directly observed. Herewe review the current status of AGNs variability investigations in Serbia, inthe perspectives of the present and future monitoring campaigns.

Investigation of active galactic nuclei in time domain era