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absorption (1) |
atmospheric cherenkov telescopes (1) |
bl lacertae objects (1) |
bl lacertae objects: individual (pks 1424+240)-cosmic background radiation (1) |
bl lacertae objects: individual: mrk 421 (1) |
energy cosmic-ray (1) |
extragalactic background light (2) |
galaxies: active (1) |
gamma rays: galaxies (2) |
gamma-ray outburst (1) |