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active galactic nuclei (1) |
atmospheric cherenkov telescopes (1) |
bl lacertae objects (1) |
bl lacertae objects: individual: mrk 421 (2) |
blazars (1) |
emission (1) |
extragalactic background light (1) |
galaxies: active (1) |
gamma rays: galaxies (1) |
gamma-ray outburst (1) |