TY CONF TI Variability of the blazar S5 1803+784 in July 2019 - December 2024 as a manifestation of the jet flow structure KW active galaxies: blazars; optical variability JO «Modern observational cosmology» dedicated to the 60th anniversary of O.V. Verkhodanov AU Butuzova, M.. AU Gorbachev, M.A. AU Guseva, V.A. AU Krivenko, A.S. AU Nazarov, S.V. AU Baida, G.V. PY 2025 PB Special Astrophysical Observatory of the Russian Academy of Sciences