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    active galactic nuclei (1)
    background-radiation (1)
    bl lacertae objects (1)
    bl lacertae objects: individual (3c 66a) (1)
    bright blazars (1)
    epoch vlbi survey (1)
    galaxies: active (1)
    gamma rays: galaxies (1)
    large-area telescope (1)
    radio-sources (1)