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active galactic nuclei (1) |
bl lacertae objects (1) |
bl lacertae objects: individual (b2 1215+30, ver j1217+301) (1) |
discovery (1) |
galaxies: active (1) |
galaxies: jets (1) |
galaxies: nuclei (1) |
gamma rays: galaxies (1) |
large-area telescope (1) |
multiwavelength observations (1) |